Black-Bottom Peanut Butter Mousse Pie

From the kitchen of Carly

A graham cracker crust cradles a dark chocolate layer and billowing peanut butter mousse in this stunning pie. The chocolate base adds richness, while the mousse keeps things light and airy. Decadent without being heavy, it's the kind of dessert that looks fancy but comes together surprisingly easy.

Black-Bottom Peanut Butter Mousse Pie

Two textures and two chocolate cousins in one slice, the chocolate bottom set firm while the peanut butter top stays airy and spoonable. This is the pie you make when you want the moment to feel fancy but the method to feel easy, built on a buttery graham cracker base that holds everything up without complaint.

Prep
n/a
Cook
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Total
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Servings
4
Difficulty
medium

Ingredients

4 servings

  • 1Nonstick vegetable oil spray
  • 7whole graham crackers, coarsely broken
  • 1/4 cupunsalted butter, melted
  • 4 tbspsugar, divided
  • 1 1/3 cupbittersweet or semisweet chocolate chips
  • 2/3 cupplus 1 3/4 cups chilled whipping cream, divided
  • 2 tbsplight corn syrup
  • 2 tspvanilla extract, divided
  • 6 ozpeanut butter chips
  • 2 tbspcreamy peanut butter

Instructions

  1. Position a rack in the center of the oven and heat it to 350°F. Coat a 9-inch glass pie dish with nonstick spray. Pulse the graham crackers, melted butter, and 2 tablespoons of sugar in a food processor until the mixture comes together in moist clumps, then press it firmly and evenly over the bottom and up the sides of the dish. Bake until the crust is lightly browned, about 15 minutes.

  2. While the crust bakes, combine the chocolate chips, 2/3 cup of cream, corn syrup, and 1 teaspoon of vanilla in a microwave-safe bowl. Microwave on medium heat for about 3 minutes, until the chocolate softens, then whisk until completely smooth and glossy. Spread the chocolate mixture in an even layer over the bottom of the baked crust, then slide the dish into the freezer for 10 minutes to set.

  3. In a large microwave-safe bowl, combine the peanut butter chips and 3/4 cup of cream. Microwave on medium heat in 15-second bursts, stirring between each, just until the chips soften. Whisk in the peanut butter and remaining 1 teaspoon of vanilla, then set aside to cool until barely lukewarm. In a separate medium bowl, beat the remaining 1 cup of cream with the remaining 2 tablespoons of sugar until the mixture is very thick but just short of holding peaks. Fold it into the peanut butter base in 3 additions, keeping the mixture light and airy. Spoon the mousse over the chocolate layer, smooth the top, and refrigerate for at least 1 hour and up to 1 day before serving.

Tips from the kitchen

  • Peanut butter chips are not the same as peanut butter, so don't skip them or swap them out; they melt smooth and silky where the real thing would turn gluey, and that texture is half the point here.
  • Watch the chocolate and peanut butter layers closely when you microwave them. Use 15-second intervals and stir constantly to avoid seizing or scorching, which will make the mousse grainy.
  • Beat the final layer of cream to just below stiff peaks (soft, thick billows that hold their shape), then fold gently into the peanut butter mixture in thirds so you don't deflate all that air you just whipped in.

Variations

  • Chocolate-only bottom: Skip the peanut butter layer entirely and double the mousse, folding in 3 tablespoons cocoa powder and an extra tablespoon sugar for a richer, deeper mousse.
  • Hazelnut swap: Replace peanut butter chips and creamy peanut butter with an equal weight of hazelnut butter and roasted hazelnut pieces folded through at the end.
  • Single-layer version: Scrape the chocolate mousse into the crust, fold the peanut butter mixture into the remaining whipped cream, and ripple it together on top for a marbled effect.

Make ahead and storage

Refrigerate in the pie dish, covered loosely with plastic wrap, for up to one day. Do not freeze; the mousse texture breaks down when thawed. Scoop straight from the fridge and eat cold.