Indulge in the ultimate layered chocolate dessert! This Mississippi Mud Pie combines a crunchy Oreo cookie crust, a rich and fudgy brownie center, smooth milk chocolate mousse, and a billowy chocolate whipped cream topping—all finished with a crisp cookie crumble. It’s a show-stopping treat that’s perfect for holidays, celebrations, or anytime you want to wow a crowd.
Why You’ll Love This Dessert
- Four irresistible layers in every bite
- Bold chocolate flavor with a variety of textures
- Make-ahead friendly—great for parties and special occasions
- Customizable with simple substitutions and flavor add-ins
Ingredients
Oreo Cookie Crust
- 25 Oreo cookies, finely crushed
- 6 tbsp salted butter, melted
Brownie Layer
- 4 oz bittersweet chocolate, chopped
- 3 tbsp salted butter, melted
- 3 tbsp vegetable oil
- 2 tbsp unsweetened cocoa powder
- ⅔ cup light brown sugar
- 2 large eggs
- 2 tsp vanilla extract
- ¼ tsp salt
- 3 tbsp all-purpose flour
Oreo Cookie Crumble Topping
- 8 Oreo cookies, roughly crushed
- 2 tbsp powdered sugar
- 1 tbsp Dutch-processed cocoa powder
- Pinch of salt
- 2 tbsp salted butter, melted
Milk Chocolate Mousse
- 6 oz milk chocolate, chopped
- 1 cup heavy cream, cold
- 2 tbsp Dutch-processed cocoa powder
- 2 tbsp powdered sugar
- Pinch of salt
Chocolate Whipped Cream
- 1 cup heavy cream
- ¼ cup granulated sugar
- 3 tbsp unsweetened cocoa powder
Step-by-Step Instructions
1. Make the Crust
Preheat your oven to 325°F (165°C).
Crush the Oreos finely using a food processor or rolling pin. Combine the crumbs with melted butter and press the mixture into a 9-inch pie plate, pressing along the bottom and up the sides.
Bake for 12–15 minutes. Let cool completely.
2. Prepare the Brownie Layer
In a microwave-safe bowl, melt the chopped chocolate, butter, oil, and cocoa powder in 20-second intervals, stirring until smooth.
Whisk in the brown sugar, eggs, vanilla, and salt. Stir in the flour until just combined.
Pour the brownie batter into the cooled crust.
Bake at 325°F (165°C) for 25–30 minutes, or until an inserted toothpick comes out with moist crumbs. Let cool completely. For best accuracy, use an instant-read thermometer (internal temp should be ~180°F/82°C).
3. Make the Cookie Crumble Topping
Crush 8 Oreos into chunks. Toss with powdered sugar, cocoa powder, and a pinch of salt. Drizzle with melted butter and stir to coat.
Spread on a parchment-lined baking sheet and bake at 325°F (165°C) for 10 minutes. Let cool.
4. Make the Chocolate Mousse
Melt the milk chocolate in 20-second intervals until smooth. Let cool to about 90–100°F (32–37°C).
In a chilled bowl, beat cold heavy cream, cocoa powder, powdered sugar, and salt until soft peaks form.
Fold one-third of the whipped cream into the melted chocolate to lighten it, then gently fold in the rest.
Spread the mousse evenly over the cooled brownie layer. Refrigerate for at least 3 hours or overnight.
5. Chocolate Whipped Cream Topping
Beat heavy cream, sugar, and cocoa powder until stiff peaks form.
Spread over the chilled mousse layer, then top with the cookie crumble.
Tips for Success
- Cool Completely Between Layers: Prevent melting by chilling thoroughly.
- Check Brownie Doneness: A thermometer ensures perfect fudginess.
- Smooth Layering: Use an offset spatula for even, clean layers.
- Flavor Boost: Add espresso powder to the mousse for mocha depth.
Variations and Substitutions
- Gluten-Free: Use gluten-free Oreos and a GF brownie mix or flour blend.
- Nutty: Stir chopped pecans or walnuts into the brownie batter.
- Dark Chocolate Lovers: Swap milk chocolate for semisweet or dark in the mousse.
- Extra Rich: Add a drizzle of chocolate ganache before the whipped topping.
FAQ
Can I use store-bought whipped cream?
Yes, but homemade has a fresher taste and holds up better.
How long does this pie last?
Store covered in the fridge for up to 3 days.
Can I freeze Mississippi Mud Pie?
Freezing is not recommended, as the mousse texture can suffer when thawed.
Serving Suggestions
- Drizzle with chocolate syrup for extra indulgence
- Garnish with chocolate curls or fresh berries
- Serve with a scoop of vanilla ice cream for the ultimate dessert plate
Final Thoughts
This Mississippi Mud Pie is the ultimate celebration of chocolate in every form—crunchy, gooey, creamy, and fluffy. Whether you’re making it for a birthday, potluck, or just to satisfy a serious chocolate craving, this pie will impress every time.