Chocolate Mousse Pie

This Chocolate Mousse Pie starts with a crisp Oreo cookie crust and is filled with a silky dark chocolate mousse enhanced with espresso for deep chocolate flavor. The rich filling is balanced by a toasted Swiss meringue that delivers a light, marshmallow-like finish without making the pie overly sweet.

The combination of dark chocolate, espresso, and an Oreo cookie crust creates a rich dessert with layers of chocolate flavor and just the right amount of crunch. Add bourbon for an optional grown-up twist, then finish the pie with golden toasted Swiss meringue for a show-stopping presentation.

Whether you're serving it for the holidays, Father's Day, date night, or simply because you're craving serious chocolate, this make-ahead pie proves that homemade chocolate desserts can be every bit as elegant as they are indulgent.

Prep Time: 40 minutes
Cook Time: About 20 minutes
Broil Time: 1-2 minutes
Chill Time: 4 hours (overnight preferred)
Total Time: About 5 hours
Yield: One 9-inch pie (8 to 10 slices)
Difficulty: Intermediate

Ingredients

Man-Made Oreo Crust

270g Oreo cookies (24 cookies)
85g unsalted butter, melted (6 tbsp)

Chocolate Mousse Filling

113g dark chocolate, finely chopped (4 oz, 60 to 70% cocoa)
113g milk chocolate chips (4 oz)
28g unsalted butter (2 tbsp)
240g heavy cream (1 cup)
30g bourbon (2 tbsp, optional)
1 teaspoon instant espresso powder
1 tablespoon hot water
1 teaspoon vanilla extract
3 large egg whites, room temperature
150g granulated sugar (¾ cup)
¼ tsp cream of tartar
¼ tsp kosher salt

Toasted Swiss Meringue

3 large egg whites, room temperature
150g granulated sugar (¾ cup)
¼ teaspoon cream of tartar
¼ teaspoon kosher salt
1 teaspoon vanilla extract

Instructions

1. Bake the Oreo Crust

Preheat the oven to 350°F (175°C).
Place the Oreo cookies, filling included, in a food processor and pulse into fine crumbs.
Stir in the melted butter until evenly coated.
Press firmly into the bottom and up the sides of a 9-inch pie plate.
Bake for 8 to 10 minutes, then cool completely.

2. Make the Chocolate Mousse

Combine the chopped dark chocolate, milk chocolate chips, and butter in a microwave-safe bowl.
Microwave in 20-second intervals, stirring after each, until smooth. Set aside to cool slightly.
Dissolve the espresso powder in the hot water, then stir it into the chocolate along with the vanilla and optional bourbon.
In a clean heatproof bowl, whisk together the egg whites, sugar, cream of tartar, and salt.
Place over a saucepan of simmering water and whisk constantly until the mixture reaches 160°F (71°C).
Transfer to a stand mixer and beat until glossy, stiff peaks form.
In a separate bowl, whip the heavy cream to stiff peaks.
Fold one-third of the meringue into the chocolate mixture to lighten it.
Gently fold in the remaining meringue until almost combined.
Fold in the whipped cream just until no streaks remain.
Spread the mousse into the cooled Oreo crust and smooth the top.
Refrigerate for at least 4 hours, preferably overnight.

3. Make the Toasted Swiss Meringue

In a clean heatproof bowl, whisk together the egg whites, sugar, cream of tartar, and salt.
Place over simmering water and whisk constantly until the mixture reaches 160°F (71°C).
Transfer to a stand mixer and beat until glossy, stiff peaks form.
Beat in the vanilla.
Spread or pipe the meringue over the chilled mousse, creating decorative peaks.

4. Toast the Meringue

Kitchen Torch (Recommended): Toast the meringue until evenly golden brown.
Broiler: Place the pie on the top oven rack and broil for 1 to 2 minutes, watching constantly, until lightly browned.

Man-Made Tips

Espresso Makes Better Chocolate: The espresso powder deepens the chocolate flavor without making the mousse taste like coffee.
Bourbon Is Optional: Bourbon adds subtle oak, vanilla, and caramel notes to the mousse. Leave it out for an equally rich alcohol-free version.
Don't Deflate the Mousse: Fold the whipped cream and meringue gently. Overmixing will knock out the air that gives the mousse its light texture.
Toast for Flavor: A lightly toasted Swiss meringue adds a delicate marshmallow flavor that balances the richness of the chocolate.
Make It Ahead: This pie slices best after chilling overnight, making it an excellent dessert for holidays, dinner parties, Father's Day, or date night.