In a microwave-safe bowl, combine the semi-sweet chocolate chips, heavy cream, corn syrup (or honey), and vanilla extract. Microwave at 50% power for 1 minute. Remove and stir with a whisk until the mixture is smooth and creamy. If chocolate chips remain unmelted, heat for an additional 15 seconds at 50% power and stir again.
Pour the chocolate mixture into your pre-baked pie crust. Use a spatula to smooth it into an even layer. Place the crust in the freezer for about 10 minutes while you make the peanut butter filling.
In a clean mixing bowl, whisk the vanilla pudding mix with 1 cup of cold milk until smooth and slightly thickened.
Microwave the peanut butter for 10 seconds to soften, then add it to the pudding mixture. Whisk until the mixture is fully combined and silky smooth.
Gently fold in the thawed Cool Whip to create a light and creamy mousse.
Remove the pie crust from the freezer. Carefully pour the peanut butter mousse over the chilled chocolate layer, spreading gently with a spatula.
Decorate as desired with chopped Reese’s mini cups and a drizzle of melted chocolate.
Refrigerate the pie for at least 2 hours (or until set) before slicing and serving. Store any leftovers in the fridge.
Notes
For a gluten-free twist, use a gluten-free pie crust and double-check your pudding mix. If you don’t have Cool Whip, whipped heavy cream (beat to stiff peaks) makes a great substitute.