Flourless Walnut Cake Recipe

4.50 from 2 votes

My Flourless Walnut Cake is a 7-ingredient treat flavored with chocolate and coffee that is delightfully different! Its slightly dense texture makes it the perfect gooey treat for a lighter dessert option!

A slice of flourless walnut cake on a serving plate.

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This unique, ground walnut cake is absolutely one of my favorite desserts to make and lots of fun to share with friends and family. The rich flavors of the walnuts and bittersweet chocolate are perfectly complemented by the coffee. It’s a sophisticated combination of sweet and bitter flavors that create a cake sure to impress.

Easy to make and store, this Flourless Walnut Cake is a timeless dessert! It pairs particularly well with softly whipped cream and with vanilla ice cream. Whether you’re making this treat for a loved one or to share with a new neighbor, it’s sure to be a people pleaser!

Of course, it’s hard to go wrong with nut-laden desserts like my delicious banana nut bread and homemade southern pecan pralines. What’s not to love about walnuts, sweet chocolate, and rich coffee? Let’s get baking!

❤ Why You’ll Love This Recipe

This cake is gooey, nutty, dense, and sweet.
It’s an easy seven-ingredient cake
Pairs well with many different garnishes.
Perfect as a light dessert or breakfast treat.

🛒 Ingredient Notes

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Walnuts – You’ll need raw, shelled walnuts (preferably halves) for the recipe.
Breadcrumbs – Use purchased plain breadcrumbs or ones you’ve made from stale bread. To make breadcrumbs, lightly toast leftover bread and then grind in a food processor.
Bittersweet Chocolate – The chocolate should be grated or shaved to help it incorporate into the batter. Along with the coffee, the chocolate imparts a mild mocha flavor to the cake.
Eggs – Provide leavening for the cake since no baking powder or baking soda is used.
Butter – Adds to the rich, chewiness of the cake.
Sugar – White granulated sugar is all that’s needed here.
Brewed Coffee – You’ll need only one tablespoon of brewed strong coffee or espresso.

You’ll find detailed measurements for all ingredients in the printable version of the recipe at the bottom of this post.

🔪 How to Make Flourless Walnut Cake

Preheat the oven to 350 degrees.

Baking pan buttered and lined with wax paper.

Prepare an 8″ pan. Butter the pan well and cut a piece of parchment or wax paper to fit the bottom. Insert and butter it, too.

Photo collage showing weighing and grinding walnuts.

Grind the walnuts and breadcrumbs together in a food processor. The walnuts should be quite fine, but don’t process too long or they’ll lose texture and become oily.

👉 PRO TIP: Watch carefully and don’t process the walnuts too long or they will turn into nut butter. When ground, nuts release their natural oils and tend to clump together. The addition of the breadcrumbs during this stage helps prevent that.

Photo collage showing cooking the egg yolks and adding the beaten egg whites.

Separate the egg whites and yolks. In the top of a double boiler, over simmering water, whisk the yolks and sugar together until they have tripled in volume and become thick and very pale yellow.
Take the yolks off the heat and stir in the nut mixture and chocolate.
Beat in the butter a tablespoon at a time until completely incorporated.
Stir in the coffee or espresso.
Whisk the egg white to stiff peaks.
Stir a small amount of the beaten whites into the batter to loosen it.

Add the batter to the remaining egg whites and gently fold it in.

Pour the batter into the prepared cake pan.
Bake until a tester inserted in the center comes out clean, approximately 35 minutes. Note – the cake will pull away from the sides of the pan during baking.
Remove the cake from the oven and let it cool completely on a wire rack before transferring to the serving plate.
Decorate with sifted confectioner’s sugar and additional walnuts, if desired. Serve with whipped, sweetened cream.

What’s not to love about this rich, tasty, dense cake? The combination of walnuts, chocolate, and coffee come together to create a nutty, sophisticated cake with a light mocha flavor that is sure to leave you wanting more.

🔀 Recipe Variations

Got a gluten allergy? You can make this walnut cake gluten free by using gluten-free breadcrumbs, crushed gluten-free crackers, corn flakes, or rolled oats.
Try swapping out the walnuts for your favorite nut. Pistachios, almonds, and cashews are a few of my favorites.
Make it kid friendly by swapping out the coffee for a non-caffeinated alternative.
I love experimenting with this recipe! Try using different types of nuts, perhaps adding some dried fruit, or making it more kid-friendly by omitting the coffee.

❗ Tips

I find that a food processor is the best way to grind your walnuts into a powder. A blender will work in a pinch but it won’t get the nuts quite as fine. Also, it’s very important that you not grind the walnuts too much turning them into walnut butter.

Swap out the coffee or espresso for a coffee substitute such as Pero or Joe’y. If, on the other hand, you can’t get enough of that delicious coffee flavor, try serving it with a scoop of coffee-flavored ice cream.

Not sure if your cake is done? Insert a toothpick into the center. If it comes out clean, the cake is ready!

🍚 Storage Information

The completely cooled cake can be stored wrapped in plastic wrap or in a reusable airtight container. Keep it in the fridge for up to a week or in the freezer for up to two months. To serve from frozen, allow the cake to thaw out in the fridge for at least 24 hours before serving. I find that this cake is best served at room temperature and that you should only add your garnishes a few minutes before serving.

🍽 Serving Suggestions

I like a simple topping of sifted confectioner’s sugar and toasted walnut halves along with a dollop of sweetened whipped cream on the side. It’s also nice with vanilla ice cream, or a drizzle of warm caramel sauce.

❓ FAQs

What does this flourless walnut cake taste like?

It’s a gooey, nutty cake with the perfect balance of sweet and bitter. The texture is similar to a dense, fudgy brownie.

What is the difference between a flourless cake and a torte?

Some people use the terms “cake” and “torte” interchangeably. A torte is typically made with little to no flour and its texture is dense rather than light. Cakes are made with a good deal more flour and have a light texture. This cake leans more toward the classical definition of a torte because of its density and tight, moist crumb.

Can you buy ground walnuts instead of making your own?

Yes! Some stores sell ground walnuts, sometimes called walnut meal, specifically for baking cakes and other desserts. If using walnut meal, you’d need to weigh out four ounces for this recipe.

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