Soft-Baked Christmas Cookie Cake with Holiday M&Ms

This is the dessert you make when you want all the joy of Christmas cookies without any rolling, cutting, or piping tiny snowflakes. It’s a giant, thick, chewy chocolate chip cookie baked in a cake pan, loaded with red and green M&Ms, and finished with a simple buttercream swirl that makes it feel like a party.

The center stays soft for days, the edges get that just-baked crispness, and the whole thing comes together in about 45 minutes. If you need a holiday dessert that feeds a crowd and looks like you fussed, this is it.

Why This Cookie Cake Stays in the Rotation

The texture is what gets me. Brown sugar and melted butter give it a deep caramel chew, and because it’s baked in a single thick layer, you get that cookie-dough softness in the middle that a sheet of thin cookies just can’t pull off.

It’s also way less work than decorated sugar cookies. No chilling the dough, no fighting with a rolling pin. You mix, press, bake, and then spend five minutes swirling on frosting before everyone grabs a slice.

My favorite part: the leftovers. Wrapped tightly on the counter, this cookie cake stays moist for three days, and a ten-second zap in the microwave brings back that warm, gooey bite like it just came out of the oven.

Ingredients

• 1/2 cup unsalted butter, melted and cooled slightly: Melted butter gives the cookie its dense, chewy crumb. Salted butter works too, just skip the added salt.
• 1/2 cup packed light brown sugar: Dark brown sugar will make it even more molasses-rich, which is lovely here.
• 1/4 cup granulated sugar: A little white sugar helps the edges crisp.
• 1 large egg, at room temperature: Cold egg won’t combine as smoothly, so let it sit out for 10 minutes if you can.
• 1 tsp vanilla extract
• 1 1/4 cups all-purpose flour, spooned and leveled: Scooping straight from the bag packs too much flour in, and you’ll end up with a dry cake. Spoon it into the cup, then sweep off the top.
• 1/2 tsp baking soda
• 1/2 tsp salt
• 1/2 cup semisweet chocolate chips: You can use all dark, all milk, or a mix.
• 1/2 cup white chocolate chips: These melt into sweet, creamy pockets that balance the semisweet nicely.
• 1/2 cup red and green M&Ms, plus more for decorating
• 1 tbsp rainbow or holiday sprinkles, plus more for the top

For the frosting (optional, but it makes it a cake):

• 1/2 cup unsalted butter, softened
• 2 cups powdered sugar
• 1 to 2 tbsp milk: Any kind works; just add enough to get a spreadable, pipeable consistency.
• 1/2 tsp vanilla extract
• Green gel food coloring: A tiny dab gives you that Christmas tree shade.

Variations and Easy Swaps

• No holiday M&Ms:: Any M&Ms or chocolate candies work. Chopped Reese’s Pieces or mint chocolate chunks are fun for the season, too.
• Gluten-free:: Swap in a 1:1 gluten-free baking flour blend that includes xanthan gum. The texture will be a little more crumbly but still good.
• No white chocolate chips:: Use butterscotch chips, toffee bits, or just double the semisweet chips.
• Peppermint twist:: Add 1/4 tsp peppermint extract to the dough and use crushed candy canes instead of sprinkles on top.
• Skip the frosting entirely:: The cookie is delicious on its own. Dust it with powdered sugar and pile the extra M&Ms on while it’s warm so they stick.

If you’re already in holiday baking mode, my peppermint bark brownies are another great no-fuss option.

How to Make Christmas Cookie Cake

Step 1: Mix the Cookie Dough

Combine the 1/2 cup melted butter, 1/2 cup brown sugar, and 1/4 cup granulated sugar in a large bowl. Use a sturdy spatula or a hand mixer on low speed and beat until the mixture looks like wet sand and the sugars are mostly dissolved, about 1 minute. It won’t be fluffy, and that’s correct. Add the egg and 1 tsp vanilla, then continue mixing until the color lightens a bit and the batter smooths out.

In a separate bowl, whisk the 1 1/4 cups flour, 1/2 tsp baking soda, and 1/2 tsp salt together. Dump the dry ingredients into the wet and mix just until no streaks of flour remain. A few dry pockets are fine; you’ll finish the job with the next step. The dough will be thick and slightly sticky.

Now fold in the 1/2 cup semisweet chips, 1/2 cup white chocolate chips, 1/2 cup M&Ms, and 1 tbsp sprinkles. Stir gently until everything is distributed. The M&Ms will leave little colorful smudges in the dough, which is exactly what you want.

Step 2: Press and Bake the Cookie

Preheat your oven to 350°F (180°C) and grease a 9-inch springform pan or round cake pan. A springform makes it easiest to unmold, but a regular cake pan lined with parchment on the bottom and greased sides works great too. Scrape the dough into the prepared pan and use your fingers or the back of a spoon to press it into an even layer, pushing it all the way to the edges.

Slide the pan onto the middle rack and bake for 22 to 25 minutes. After about 20 minutes, check it. The edges should be light golden brown and pulling away from the sides just slightly, while the center looks set but still soft. A toothpick inserted in the middle will have moist crumbs clinging to it, not raw batter.

Remove the pan and set it on a cooling rack. Let the cookie cool in the pan for 10 minutes. If you used a springform, release the ring and leave the cookie on the base to continue cooling. If using a regular pan, run a knife around the edge, then carefully flip the cookie out onto the rack and flip it right-side up to cool completely. The cookie needs to be room temperature before you frost it, which takes about an hour.

Step 3: Whip Up the Frosting

While the cookie cools, make the frosting. Beat the 1/2 cup softened butter in a medium bowl with a hand mixer until it’s smooth and pale, about 2 minutes. Add the 2 cups powdered sugar in two batches, mixing on low until combined each time. Pour in 1 tbsp milk, 1/2 tsp vanilla, and a small dab of green gel food coloring.

Beat everything on medium speed for about 2 minutes, scraping the bowl once. The frosting should be fluffy and spreadable. If it seems stiff, add the remaining 1 tbsp milk, a little at a time, until it holds a soft peak but can still be piped. You’re looking for a consistency that holds its shape but doesn’t tear the cookie when you spread it.

Step 4: Frost the Cookie Cake

Spread a thin layer of green frosting all over the top of the cooled cookie, leaving about an inch bare around the edge if you want that cookie-rim look. This base layer catches any loose crumbs and gives you a smooth surface. Scoop the rest of the frosting into a piping bag fitted with a large star tip.

Pipe rosettes or a continuous border around the outer edge. If you don’t want to pipe, just mound the remaining frosting in the center and swirl it with a knife. The key is keeping it rustic; this is a cookie, after all, not a wedding cake.

Step 5: Pile On the Sprinkles and Serve

Scatter the extra M&Ms and a generous handful of sprinkles over the frosting while it’s still soft so they stick. Let the cake sit for about 15 minutes so the frosting can set just enough to slice cleanly.

Use a sharp knife to cut it into wedges and serve at room temperature. Each slice will have that chewy cookie edge and a soft, frosting-crowned middle.

Tips for a Chewy, Gooey Cookie Cake

• Check for doneness early. Every oven runs a little differently, and you want to pull the cookie when the center still has a slight jiggle; it will continue cooking from the pan’s heat.
• Use room-temperature egg. Even 10 minutes in a bowl of warm water makes a difference in how evenly the dough comes together.
• Softened butter for the frosting is non-negotiable. If it’s too cold, the frosting gets lumpy; too melty, and it won’t hold a piped shape.
• Let the cookie cool completely. Warm cookie plus buttercream equals a melted, slippery mess. That hour on the rack is worth it.

A quick timing guide for different pan sizes:

Storing the Cookie Cake

• Refrigerate:: Covered tightly, it keeps for up to 5 days. The frosting stays firm, and the cookie stays moist.
• Room temp:: If you plan to finish it within 2 days, leave it on the counter under a cake dome or wrapped loosely in foil. The frosting will soften but hold.
• Reheating a slice:: Pop it in the microwave for 10 seconds. The frosting will melt a little, which feels fancy.

Frequently Asked Questions

Can I skip the frosting?

Yes. The unfrosted cookie cake is basically a giant skillet cookie, and it’s wonderful on its own or with a scoop of vanilla ice cream.

My cookie cake turned out hard. What went wrong?

It was baked a few minutes too long, or the flour was over-measured. Spoon and level the flour, and pull the pan when a toothpick still has moist crumbs.

Can I make this ahead and freeze it?

You can bake the cookie up to a day early. Wrap it unfrosted and store at room temperature. For longer storage, wrap the cooled, unfrosted cookie in plastic and freeze for up to 1 month. Thaw overnight on the counter, then frost and decorate.

What pan works best?

A 9-inch springform pan is ideal because the ring lifts away cleanly. A standard round cake pan works too, just line the bottom with parchment and grease the sides well.

Christmas Cookie Cake Recipe

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 25 minutes mins

Total Time 45 minutes mins

Servings: 12 servings

Calories: 410

Ingredients Method Notes

Ingredients

  

• 1/2 cup unsalted butter, melted and cooled slightly
• 1/2 cup packed light brown sugar
• 1/4 cup granulated sugar
• 1 large egg, at room temperature
• 1 tsp vanilla extract
• 1 1/4 cups all-purpose flour, spooned and leveled
• 1/2 tsp baking soda
• 1/2 tsp salt
• 1/2 cup semisweet chocolate chips
• 1/2 cup white chocolate chips
• 1/2 cup red and green M&Ms, plus more for decorating
• 1 tbsp rainbow or holiday sprinkles, plus more for the top
• 1/2 cup unsalted butter, softened (for frosting)
• 2 cups powdered sugar
• 1 to 2 tbsp milk
• 1/2 tsp vanilla extract
• Green gel food coloring

Method

 

1. Mix 1/2 cup melted butter, brown sugar, and granulated sugar until combined. Add egg and 1 tsp vanilla, mixing until smooth. Whisk flour, baking soda, and salt, then stir into the wet ingredients. Fold in both chocolate chips, 1/2 cup M&Ms, and 1 tbsp sprinkles.
2. Preheat oven to 350°F (180°C). Press dough into a greased 9-inch springform or cake pan in an even layer. Bake for 22 to 25 minutes until edges are golden and center is set but soft. Cool in pan 10 minutes, then unmold and cool completely on a rack.
3. Beat 1/2 cup softened butter until pale. Gradually add powdered sugar, then 1 tbsp milk, 1/2 tsp vanilla, and green food coloring. Beat until fluffy, adding more milk if needed.
4. Spread a thin layer of frosting over the cooled cookie. Pipe or swirl remaining frosting on top. Scatter extra M&Ms and sprinkles over the frosting.
5. Let set 15 minutes, then slice into wedges and serve.

Notes

The total time does not include cooling, which takes about 1 hour before frosting. For the cleanest slices, chill the finished cookie cake for 20 minutes. The frosting is optional; the cookie tastes great with just a dusting of powdered sugar.