INGREDIENTS
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For the peanut butter cookie crust:
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2/3 cup all-purpose flour
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1/2 tsp baking powder
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1/8 tsp baking soda
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pinch of salt
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1/4 cup unsalted butter
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1/3 cup creamy peanut butter
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1/4 cup sugar
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1/4 cup firmly packed dark brown sugar
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1 large egg yolk
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1/2 tsp vanilla extract
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For the chocolate-peanut butter mousse filling:
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2 ounces bittersweet chocolate, chopped finely
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1 3/4 cup milk
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2 tbsp cornstarch
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1/2 cup sugar
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pinch of salt
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2 large egg yolks
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1/2 cup peanut butter
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1/2 tsp vanilla extract
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1 cup heavy cream, chilled