Cookie Cake

A cookie cake is one giant chocolate chip cookie baked in a round pan and frosted with chocolate buttercream. I make it when I want the pull of a warm cookie, but the look of a cake, and it takes about the same effort as a batch of cookies with none of the scooping.

The trick that keeps this from turning into a dense biscuit is pulling it while the center still looks a touch underdone. You’ll get a soft, chewy middle and set edges, which is exactly what a frosted cookie cake should be.

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Why You’ll Love This Recipe

• One bowl for the base, one for the frosting, and no cookie scoop or tray rotation, so there’s less washing up than a batch of individual cookies.
• The center bakes soft and chewy on purpose, and the set edges hold a clean slice.
• It’s an easy birthday cake alternative for anyone who’d rather have a cookie than sponge, and you can write the message straight onto the frosting.
• You can bake it a day ahead and frost it when you’re ready.

Ingredients You’ll Need

You’ll need all the ingredients shown in the photograph below.

Unsalted butter, softened. You need it for both the cookie base and the frosting, and it has to be room temperature. Cold butter won’t cream properly with the sugar, and melted butter makes the dough greasy and the cake flat. Pull it from the fridge half an hour ahead so it’s soft but not oily.

Brown sugar and granulated sugar. The base uses 2/3 cup brown and 1/3 cup white. The brown sugar is what gives you the chew and the slight toffee note; leaning more heavily on it than on white sugar is what separates a cookie cake from a plain sponge.

Semi-sweet chocolate chips. A full cup goes into the dough, and 2 tablespoons get scattered on top before baking, so buy a standard bag, and you’ll have what you need. Semi-sweet balances the sweet frosting, but if you like a darker edge, dark chocolate chips work with no other change.

Unsweetened cocoa powder. This is what makes the frosting chocolate rather than plain vanilla buttercream. Natural or Dutch-process both work here.

Powdered sugar. It sweetens the frosting and gives it the body to hold the frosting. Add it gradually so you can stop at the consistency you want.

Sprinkles. Optional, and the place to match the cake to the occasion. Swap in mini chocolate chips or colored sugar if that suits the table better.

How to Make Cookie Cake with Step-By-Step Instructions

A complete printable recipe and the measurements in both US customary and metric are available in the recipe card below.

Prep the Pan

Preheat the oven to 350F and grease a 9-inch round cake pan, then line the bottom with parchment. The parchment is what lets you lift the whole cake out clean once it’s cool, so don’t skip it.

Cream the Butter and Sugars

Beat the softened butter with the brown sugar and granulated sugar until it’s light and fluffy, about 2 to 3 minutes. Add the eggs one at a time, mixing well after each, then stir in the vanilla. Getting air into the butter here is what keeps the finished cake from being heavy.

Add the Dry Ingredients

Add the flour, salt, and baking soda and mix on low just until combined. Stop as soon as you don’t see dry flour. Overmixing develops the gluten and leaves the base dense and tough instead of tender. Fold in 1 cup of the chocolate chips by hand.

Fill the Pan

Press the dough evenly into the pan with your fingers or the back of a spoon. It’s a thick dough, more like pressing than pouring. Scatter the remaining 2 tablespoons of chocolate chips over the top so every slice gets a few melty chips on the surface.

Bake

Bake for 20 to 25 minutes, until the top is lightly golden and the edges are set. Start checking at 20 minutes. The center should still look slightly soft when you pull it, because it firms up as it cools and that’s what gives you the chewy middle. Let it cool completely in the pan.

Make the Chocolate Frosting

For the frosting, whisk the 4 tablespoons of butter together with the cocoa powder, milk, and vanilla until smooth, then work in the powdered sugar and beat until fluffy, about 1 to 2 minutes. If it’s too thick to pipe, add another teaspoon of milk; if it’s too thin, add more powdered sugar a spoonful at a time.

Decorate and Serve

Lift the cooled cake out of the pan and set it on a serving plate. Spoon the frosting into a piping bag with a star tip, or a zip-top bag with one corner snipped, and pipe swirls around the edge or spread the frosting on top. Add sprinkles if you’re using them.

Piping only the rim leaves room in the middle for a written message if this is standing in for a birthday cake.

Recipe Notes and Expert Tips

• Weigh the bake by color and edge, not the clock. Ovens vary, and the line between chewy and dry is a couple of minutes. Set edges and a lightly golden top mean it’s done, even if that lands before 25 minutes.
• Let it cool fully before you frost. If the cake is even slightly warm, the buttercream will slide off. Give it at least an hour in the pan.
• Press, don’t pour. The dough is stiff. Pressing it in with your fingers gets a more even layer than trying to spread it.
• Match the frosting to your piping. Thicker holds a sharper star swirl; a touch thinner is easier to pipe if you’re new to it. The milk and sugar let you dial it either way.

Recipe Variations

• Dark or milk chocolate chips stand in for the semi-sweet one-for-one, shifting the sweetness down or up. It’s a swap I’ve made both ways, and it changes nothing about the bake.
• For crunch, fold half a cup of chopped toasted pecans or walnuts in with the chocolate chips. It’s a swap I like when I want more texture, and it doesn’t change the bake time, though it does make the stiff dough a little harder to press flat.
• Skipping the cocoa gives you a plain vanilla buttercream from the same butter, milk, vanilla, and powdered sugar. I haven’t tested that version here, but it’s an ordinary buttercream and behaves the same way.
• Once you’ve gone vanilla, coloring the frosting and matching the sprinkles to a holiday or a theme is a decoration-only change with nothing tested about it that could go wrong, since the base cake never changes.

How to Store Leftovers

Keep the frosted cookie cake at room temperature in an airtight container for 2 to 3 days. That’s how it holds its texture best. For longer, it chills for up to a week, though the base firms up in the fridge and eats better closer to room temperature.

It freezes well for up to 2 months. Flash-freeze the frosted cake on a baking sheet for an hour first so the frosting sets hard, then wrap it well; that keeps the frosting from sticking to the wrap. Thaw at room temperature before serving.

Made ahead without frosting, the bare cookie cake keeps a day at room temperature under a cover, and you frost it the day you serve.

What to Serve With Cookie Cake

For a birthday or a party table, I set this out alongside a couple of other easy sweets so there’s a spread rather than a single cake. A batch of Oreo Balls works because they’re no-bake and you can make them while the cookie cake cools.

If you want a second baked option that shares this one’s chocolate register, my Chocolate Cake covers anyone who wants an actual sponge. A scoop of vanilla ice cream on a warm slice is the simplest thing you can do, and it’s still the one I’d pick.

More Easy Dessert Recipes for You to Try at Home

If the cookie cake goes over well, here’s where I’d head next.

• Soft and Chewy Chocolate Chip Cookies are the same dough idea scooped into individual cookies, for when you don’t want to slice a cake.
• Easy Whoopie Pie Recipe gives you soft chocolate cakes sandwiching a creamy filling, which is a good pick if the buttercream was your favorite part here.
• Oreo Cheesecake Recipe is the move when you want a proper baked showstopper and don’t mind the longer chill.
• Soft Peanut Butter Cookies are the salty-sweet counter to all this chocolate, and they bake even faster than the cake.