Cookies and Cream Mousse Cake

Moist chocolate cake, fluffy whipped cream, and crunchy Oreo crumbs come together in this easy cookies and cream mousse cake. The filling is a simple whipped-cream mousse—no eggs, gelatin, or cooking required. After a little time in the refrigerator, the layers settle into a creamy dessert that feels special without requiring complicated decorating.

Recipe at a Glance

• Prep time: About 20 minutes, using a cooled cake
• Chill time: At least 2 hours
• Yield: Approximately 8 servings, depending on cake size

Ingredients

• 1 prepared chocolate cake, completely cooled
• 10 Oreo cookies, including the cream filling
• 2 cups cold heavy whipping cream
• 2 tablespoons powdered sugar

Instructions

1. Prepare the Cake Layers

Bake your favorite chocolate cake according to its recipe or package instructions, then let it cool completely. A ready-made chocolate cake also works.

Using a long serrated knife, carefully slice the cake horizontally into two even layers. If the top is very domed, trim it slightly so the layers stack securely.

2. Crush the Cookies

Place the Oreos in a sealed food-storage bag and crush them with a rolling pin, or pulse them briefly in a food processor. Aim for mostly fine crumbs with a few small pieces for texture. Large chunks can make the cake harder to slice.

3. Whip the Cream

Pour the cold heavy cream into a large mixing bowl. Add the powdered sugar and beat with an electric mixer until firm peaks form. The cream should hold its shape when you lift the beaters, but still look smooth. Stop before it becomes grainy.

4. Make the Cookies and Cream Filling

Gently fold the crushed Oreos into the whipped cream with a spatula. Use slow, sweeping motions to keep the filling light and airy.

5. Assemble the Cake

Place the bottom cake layer on a serving plate. Spread about half the cookies and cream filling evenly over it, leaving a small border around the edge.

Set the second cake layer on top without pressing down firmly. Spread the remaining filling over the top.

6. Chill and Serve

Refrigerate the assembled cake for at least 2 hours before serving. This gives the filling time to firm up slightly and allows the cookie crumbs to soften.

Slice with a sharp knife, wiping the blade between cuts for neater portions. Keep the cake chilled until ready to serve.

Tips for the Best Results

• Cool the cake fully. Even a slightly warm cake can soften the whipped cream and cause the layers to slide.
• Start with cold cream. A chilled bowl and beaters can also help the cream whip well.
• Fold gently. Stirring vigorously knocks air out of the filling.
• Avoid overfilling. If your cake is small, serve any extra mousse alongside the slices rather than making an unstable stack.

Storage

Cover the cake gently or place it in a cake container and refrigerate for up to 3 days. It is best enjoyed within the first 24–48 hours, while the cream is fluffy and the cake stays moist. Because the filling is made with fresh cream, do not leave it at room temperature for more than 2 hours.

A Simple Dessert with Bakery-Style Appeal

This cookies and cream mousse cake turns a prepared chocolate cake into a layered treat with just a few extra ingredients. Rich chocolate, lightly sweetened cream, and familiar cookie flavor make every chilled slice an easy crowd-pleaser.