No-Bake Oreo Mousse Cake Recipe: Creamy Chocolate Cookie Delight

Take your dessert game up a notch with this Oreo Mousse Cake. A light, airy cookies-and-cream mousse layered over a fudgy brownie base creates a show-stopping treat that’s as easy to make as it is impressive.

Baking desserts with a brownie bottom is one of my favorite ways to create an elegant, crowd-pleasing cake without a lot of fuss. If you haven’t tried a brownie-based dessert, you’re in for a treat. The fudgy base adds a rich chocolate contrast to the fluffy mousse on top.

For this version, I topped a homemade brownie with a cookies-and-cream fluff made from cream cheese, Cool Whip, powdered sugar, and chopped Oreos. The result is smooth, creamy, and perfectly balanced between chocolate and sweet cream. After a short chill, the cookie pieces soften and give the mousse a cake-like texture that melts in your mouth.

Why this works

The combination of a chewy brownie crust and a light Oreo mousse is a classic flavor and texture pairing. You can use homemade brownies or a boxed mix for convenience — either will taste delicious. The crushed cookies in the mousse deepen the cookies-and-cream flavor, and chilling allows the filling to set up nicely for tidy slices.

This cake makes an excellent dessert for birthdays, potlucks, or any gathering where you want to impress without spending hours in the kitchen.

Key ingredients

With a few pantry staples you can assemble this elegant Oreo dessert. It works well in a springform pan or a square baking dish.

• Brownies – Use your favorite homemade brownie recipe or an 8×8 boxed mix for an easy shortcut.
• Cream cheese – Full-fat block cream cheese gives the best texture and flavor for the no-bake mousse.
• Powdered sugar – Sweetens and smooths the cream cheese mixture.
• Cool Whip – One 8-ounce container, thawed, keeps the mousse light. You can substitute homemade whipped cream if you prefer.
• Oreo cookies – Classic Oreos are ideal, but any chocolate sandwich cookie works. For variation, try mint or peanut butter Oreos.

How to make an Oreo Mousse Cake

Follow these straightforward steps to assemble the cake. It chills in the refrigerator to set up, making it convenient to prepare ahead.

For the brownie base

1. Prep the pan. Line an 8 or 9-inch springform pan with parchment and spray the sides with nonstick spray.
2. Make the brownie batter. Combine the ingredients for your chosen brownie recipe, fold in chopped Oreos, and spread the batter into the prepared pan. Bake 25–30 minutes depending on pan and recipe. Cool completely.
3. Reinsert into pan. Run a knife around the edge, remove the sides, peel off the parchment, then return the brownie to the pan base and reattach the sides.

For the Oreo mousse

1. Prepare the no-bake filling. Beat softened cream cheese with powdered sugar until smooth. Gently fold in Cool Whip (about 2 cups).
2. Add the cookies. Stir in about half the Oreos as crumbs and the other half chopped into small chunks for texture. If you prefer a whiter filling, chop all the cookies finely.
3. Assemble and chill. Spread the mousse over the cooled brownie and refrigerate 1–2 hours to let the filling set.
4. Remove from the pan. Run a knife around the edge before unlatching the springform sides and lifting them off carefully.

Decorate and serve

1. Pipe whipped swirls. Spoon remaining Cool Whip into a piping bag fitted with a star tip and pipe swirls around the cake edge.
2. Top with Oreos. Garnish swirls with mini Oreos and scatter chopped Oreo pieces across the top.

Storage recommendations

Store leftovers covered in the refrigerator for up to 5 days. For longer storage, freeze the undecorated cake for up to 1 month; thaw overnight in the fridge and add toppings just before serving. Note that the mousse’s texture may change slightly after freezing but will remain tasty.

Tips and tricks

• Check the seal on your springform pan before baking by filling it with water; if it leaks, use a different pan or wrap the outside with foil.
• Plan ahead: Cool Whip must thaw and the assembled cake needs chilling time to set properly.
• Short on time? Use a boxed brownie mix.
• Use a rolling pin or knife to chop cookies into pieces, and a food processor for fine crumbs.
• If you line the pan with parchment, remove the paper before adding the mousse for the cleanest finish.
• Bake the brownie on a cardboard cake circle if you plan to transfer the finished cake to a serving plate—open the springform and slide the cake onto the plate.
• For neat slices, dip a sharp knife in hot water, dry it, and cut each slice, repeating between cuts.

Recipe FAQs

Other cookies-and-cream desserts

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Recipe

Oreo Mousse Cake

Yield:
12 slices

Prep Time:
30 minutes

Cook Time:
25 minutes

Additional Time:
2 hours

Total Time:
2 hours 55 minutes

Light, fluffy cookies-and-cream mousse atop a fudgy brownie base makes this Oreo Mousse Cake an elegant dessert that’s simple to assemble and perfect for entertaining.

Ingredients

For the brownie bottom

• ½ cup unsalted butter, melted
• ¼ cup dark cocoa powder
• 2 large eggs
• 1 cup granulated sugar
• 1 teaspoon vanilla extract
• ½ teaspoon table salt
• ¼ teaspoon baking powder
• ¾ cup all-purpose flour
• 10 Oreos, chopped into chunks

For the Oreo mousse

• 1 (8-ounce) cream cheese, softened
• ½ cup powdered sugar
• 1 (8-ounce) container Cool Whip, thawed and divided
• 5 Oreos, crushed into crumbs
• 5 Oreos, chopped into chunks

For the topping

• 5 Oreos, chopped into chunks
• 18 mini Oreos

Instructions

1. Preheat oven to 350°F. Line a 9-inch springform pan with parchment paper.
2. Stir together melted butter and cocoa powder; set aside.
3. Beat sugar, eggs, and vanilla until combined. Mix in the butter mixture.
4. Add flour, salt, and baking powder; mix until just combined. Gently fold in cookie chunks.
5. Spread brownie batter into the prepared pan and bake about 25 minutes. Remove and cool completely.
6. Unlatch the pan and run a knife around the edge. Flip the brownie, peel off parchment, return it to the springform base, and reattach the sides.
7. Beat cream cheese and powdered sugar until smooth. Fold in 2 cups of Cool Whip gently.
8. Stir in cookie crumbs and chunks, spread the mousse over the cooled brownie, and refrigerate 1–2 hours to set.
9. Top with Cool Whip swirls, mini Oreos, and chopped Oreos before serving.

Notes

• Check springform seals before filling with batter to avoid leaks—fill with water to test if unsure.
• Plan ahead: allow time for Cool Whip to thaw and the assembled cake to chill.
• Use a boxed brownie mix if you want a quicker option.
• You can bake the brownie in an 8- or 9-inch round, square pan, or springform. Double the recipe for a 9×13 pan.
• If using parchment, remove it before adding the mousse for a cleaner presentation.
• For clean slices, warm a sharp knife under hot water, dry it, and wipe between cuts.