Easy Butterscotch Walnut Fudge

This easy Butterscotch Walnut Fudge is rich, buttery, and packed with warm brown-sugar flavor. Made in the microwave with marshmallows and walnuts, it's perfect for fall gatherings and Christmas candy trays.

When I was growing up, my grandparents always had butterscotch hard candies at their house. They were individually wrapped and kept in a little glass candy jar, ready for anyone who happened to wander by.

At the time, I pretty much classified butterscotch as “old people candy.” You know what I mean. Chocolate was exciting. Butterscotch was the candy you found at Grandma and Grandpa's house.

Well, friends, apparently I've crossed the Rubicon, because these days I absolutely love butterscotch.

Maybe part of the appeal is that I've come to appreciate what a simple, old-fashioned flavor it really is. At its heart, butterscotch is all about butter and brown sugar—nothing exotic or fancy, just familiar ingredients that generations of home cooks have kept on hand.

And this fudge captures everything I love about that flavor. It's buttery and creamy, with deep brown-sugar notes and a flavor that reminds me a little of caramel, toffee, and even my homemade maple fudge.

Add a generous helping of walnuts and you've got a candy that tastes like it belongs in an old-fashioned glass candy dish.

Only now I'm the one filling the dish.

Apparently these things really do come full circle.

An Easy Fudge Experiment

This recipe actually came about because I'd just made a batch of traditional Fantasy Fudge with chocolate and pecans. I made that fudge in the microwave, and it turned out so beautifully that I immediately started wondering what else I could do with the same basic method.

I knew I had a bag of butterscotch chips in the pantry. I also happened to have a huge bag of walnuts that needed a purpose, so things were already looking promising.

I didn't have another jar of marshmallow creme, but I did have a bag of miniature marshmallows. I weighed out seven ounces—the same weight as the jar of marshmallow creme I'd used in my chocolate fudge—and decided to give it a try.

I also knew I wanted brown sugar in this version. I love those warm, almost maple-like flavors, and it seemed silly to make a butterscotch fudge without taking advantage of the flavor brown sugar could bring to the party.

So I replaced one cup of the granulated sugar with brown sugar, swapped the chocolate chips for butterscotch chips, traded the pecans for walnuts, and replaced the marshmallow creme with miniature marshmallows.

Everything came together just as easily as the chocolate version.

And before I'd even finished scraping the bowl, I knew I was onto something. The silicone spatula was covered in warm butterscotch fudge, and naturally I had to taste it.

Friends, it was delicious.

What Is Butterscotch, Anyway?

Butterscotch is one of those flavors almost everyone recognizes, but you might not have stopped to think about what actually makes something taste like butterscotch.

At its simplest, traditional butterscotch is associated with brown sugar and butter. The molasses in brown sugar gives it that deeper, warmer flavor that distinguishes it from a straightforward caramel made primarily from white sugar.

That's also why butterscotch can sometimes remind you of maple, caramel, or toffee. They're different flavors and preparations, but they share some of those wonderful cooked-sugar notes.

And perhaps that's one reason butterscotch feels so wonderfully old-fashioned. You don't need an exotic ingredient to create that basic flavor combination. Butter and brown sugar are humble kitchen staples—the sort of ingredients home bakers have worked with for generations.

For this fudge, I reinforced those familiar flavors with butterscotch baking chips. The result is unmistakably butterscotch, with the brown sugar adding even more depth.

Ingredients You'll Need

This fudge is made with just a handful of simple ingredients: granulated sugar, brown sugar, butter, evaporated milk, butterscotch chips, miniature marshmallows, vanilla extract, and chopped walnuts.

You'll notice that I used evaporated milk, not sweetened condensed milk. The two products aren't interchangeable in this recipe, so be sure to grab the right can.

You'll also need seven ounces of miniature marshmallows. I weighed mine on a kitchen scale rather than measuring by volume, and they melted beautifully into the hot fudge mixture.

And yes, I'm going to repeat the lesson I learned while making my chocolate Fantasy Fudge: use a very large microwave-safe bowl.

Once that sugar mixture starts boiling, it expands dramatically. Give it plenty of room.

How to Make Butterscotch Walnut Fudge

Prepare your pan first so it's ready when you need it. I like an approximately 8 x 11-inch pan because it gives me nice, substantial pieces of fudge without making them overly thick. Line the pan with parchment paper or foil so you can easily lift the finished fudge out for cutting.

Place the granulated sugar, packed brown sugar, butter, and evaporated milk into a very large microwave-safe bowl. Microwave until the butter is completely melted and the mixture is hot and thoroughly combined, stopping to stir as necessary. In my microwave, the initial melting stage takes approximately two to three minutes.

Once everything is melted, continue microwaving for another six minutes, stopping every two minutes to stir thoroughly. The mixture will get extremely hot and will rise substantially in the bowl, so use oven mitts and handle it with care.

When the cooking time is complete, carefully remove the bowl from the microwave. Add the butterscotch chips and stir until they're melted and the mixture is smooth.

Add the seven ounces of miniature marshmallows and continue stirring. I wasn't sure how differently the marshmallows would behave compared with marshmallow creme, but they melted right into the hot mixture and incorporated beautifully.

Stir in the vanilla, then fold in the chopped walnuts.

Immediately spread the fudge into your prepared pan and smooth the top. Leave it at room temperature until completely cool and firm before lifting it from the pan and cutting it into squares.

Serve and Enjoy!

Mini Marshmallows Worked Beautifully

One of my favorite discoveries while developing this recipe was that I didn't actually need a jar of marshmallow creme.

I happened to have exactly seven ounces of miniature marshmallows left in a bag, so I decided to use the same weight of marshmallows as the marshmallow creme called for in my chocolate Fantasy Fudge.

They melted seamlessly into the hot mixture.

That's handy information for those times when you decide to make fudge and discover you don't have marshmallow creme in the pantry. If you've got a bag of miniature marshmallows, you might already have what you need.

Why I Used Both Brown and White Sugar

My original chocolate Fantasy Fudge used three cups of granulated sugar, and since that recipe set beautifully, I didn't want to start tinkering too dramatically with the basic proportions.

For this version, I kept the three cups of total sugar, but used two cups of granulated sugar and one packed cup of brown sugar.

That gave me the brown-sugar flavor I wanted without completely changing the basic structure of the recipe. Combined with the butter and butterscotch chips, that one cup of brown sugar gives this fudge a warm, rich flavor that reminds me just a little bit of maple fudge.

If you love caramel, butterscotch, maple, and toffee flavors, I think you're going to love this one.

Why Walnuts?

If you read my chocolate Fantasy Fudge recipe, you already know I used pecans in that one. I'm a Texas baker. Pecans were happening. End of story.

But for this butterscotch version, I deliberately reached for walnuts.

Walnuts have a deeper, slightly earthy flavor that provides a wonderful contrast to the sweetness of the fudge. Butterscotch is rich, buttery, and sweet, so those little pieces of walnut keep each bite interesting and add just the right amount of crunch.

There's also something about the combination of butterscotch and walnuts that simply feels old-fashioned to me. Maybe it's that little glass candy jar talking, but these flavors seem like they belong together.

And, as luck would have it, I had a huge bag of walnuts on hand. I was more than happy to find such a delicious way to use some of them.

A Perfect Fudge for Fall

Chocolate fudge will always have a special place on a Christmas candy tray, but this butterscotch version practically begs to come out earlier in the season.

There's something about brown sugar, butter, butterscotch, and toasted-nut flavors that feels right at home in autumn. This would be lovely on a dessert tray for a fall get-together, Thanksgiving dinner, church potluck, harvest party, or any cozy gathering where you want a little something sweet.

And because it's fudge, a little goes a long way. Cut it into small squares and arrange it with cookies or other bite-sized desserts. Those golden-brown pieces with bits of walnut running through them will look beautiful among your other fall treats.

Best of all, there's no decorating involved. No piping bags, no frosting, no individual dipping. Make the fudge, let it set, slice it, and you're ready to go.

Add It to Your Christmas Candy Tray

Don't put this recipe away when fall ends, though. It's also going straight onto my Christmas candy list.

In fact, I think this Butterscotch Walnut Fudge and my traditional Fantasy Fudge belong side by side on a Christmas cookie and candy tray.

The traditional version is dark and chocolatey, filled with pecans. This one is golden and buttery with walnuts. They're completely different in flavor and appearance, but they're made with essentially the same easy microwave technique.

Cut both into small squares and surround them with Christmas cookies, truffles, brittle, meringues, dipped candies, and whatever else you're making that year. You'll have two very different homemade fudges without doubling your workload.

And because fudge can be stored at room temperature, neither one has to compete for valuable Christmas refrigerator space.

That's always a win in my kitchen.

Fun Variations to Try

I almost added something extra to this very first batch.

I had speculoos cookies in the pantry, and I stood there seriously considering crushing a few and folding them into the fudge. But in the end, I decided against it. When I'm developing a new recipe, I like to know whether the basic version works before I start adding bells and whistles.

Now that I've tasted this butterscotch-walnut combination, however, those speculoos cookies might not be safe the next time around.

A Butterscotch Speculoos Fudge with broken cookie pieces folded through the mixture would be delicious. You could even sprinkle some crushed cookies over the top before the fudge sets.

You could also try pecans instead of walnuts, stir in toffee bits, or add a tiny amount of maple extract if you want to emphasize those maple-like notes. A sprinkle of flaky sea salt over the top could provide a lovely contrast to all that sweetness.

Just keep in mind that additions can affect the final texture, particularly if they introduce extra moisture. When I'm experimenting with fudge, I prefer dry mix-ins like nuts, cookies, or toffee pieces.

Frequently Asked Questions

What does butterscotch fudge taste like?

This fudge has a warm, buttery brown-sugar flavor with notes that might remind you of caramel, toffee, or maple. The butterscotch chips reinforce that flavor, while the walnuts add a nutty contrast and keep the candy from tasting one-dimensionally sweet.

Is butterscotch the same thing as caramel?

They're related, but they're not exactly the same. Traditional butterscotch is closely associated with brown sugar and butter, while traditional caramel is generally made by cooking white granulated sugar. That brown sugar gives butterscotch its characteristic deeper, molasses-like flavor.

Can I use marshmallows instead of marshmallow creme in fudge?

Yes! I used seven ounces by weight of miniature marshmallows in this recipe, and they melted smoothly into the hot fudge mixture. If you're substituting marshmallows, I recommend weighing them rather than relying on a cup measurement so you can reproduce the amount I used.

Can I use marshmallow creme instead?

Absolutely. This recipe was adapted from my chocolate Fantasy Fudge, which uses a 7-ounce jar of marshmallow creme. You can use one 7-ounce jar in place of the seven ounces of miniature marshmallows.

Can I use pecans instead of walnuts?

Yes. Pecans would be delicious in this fudge. I chose walnuts because their slightly earthy flavor contrasts beautifully with the sweet butterscotch, and I love the old-fashioned combination of butterscotch and walnuts.

Can I leave out the nuts?

Yes. The walnuts add flavor and texture but aren't required for the fudge to set. Simply omit them if you prefer nut-free fudge.

Why do you use both white and brown sugar?

I wanted to preserve the total amount of sugar from the Fantasy Fudge recipe that inspired this version while adding the deeper flavor of brown sugar. Two cups of granulated sugar plus one cup of packed brown sugar gave me three cups total while adding those warm caramel and almost maple-like notes I wanted.

Can I use sweetened condensed milk instead of evaporated milk?

No. Sweetened condensed milk contains a significant amount of added sugar and behaves very differently. Use evaporated milk for this recipe.

Why didn't my fudge set?

Undercooking is one possible culprit. The sugar mixture needs sufficient cooking time before you add the butterscotch chips and marshmallows. My method involves an initial two-to-three-minute heating period to melt the butter and thoroughly heat the ingredients, followed by another six minutes of cooking, stopping every two minutes to stir. Microwave wattages vary, so watch your mixture as well as the clock.

Does Butterscotch Walnut Fudge need to be refrigerated?

No. Once completely cool and set, it can be stored in an airtight container at room temperature. If your kitchen is particularly warm, you can refrigerate it, though the texture will be firmer when chilled.

Can I make this fudge ahead of time?

Yes, which makes it especially handy for holiday entertaining. Make the fudge ahead, allow it to cool and set completely, then cut it into squares and store it in an airtight container. If you're stacking the pieces, separate the layers with parchment or wax paper.

What size pan should I use?

I like an approximately 8 x 11-inch pan because I enjoy the thickness it gives the finished pieces. You can use a different size according to preference. A larger pan will make thinner fudge, while a smaller pan will make thicker pieces.

Thanks for Stopping By!

If you make this fudge and love it, please leave a comment or review. And before you go, why not pin some photos to your Pinterest boards?

About the Baker

I'm Janice, the baker and recipe developer behind Out of the Box Baking. I love taking familiar, old-fashioned flavors and finding easy ways to bring them into today's kitchen.

Butterscotch takes me straight back to the little glass candy jar at my grandparents' house—the one filled with individually wrapped candies that I once thought of as “old people candy.” Somewhere along the way, I developed a real appreciation for those buttery brown-sugar flavors.

And now I've apparently become the person making homemade butterscotch candy.

Funny how that works. ❤️