Chocolate Peanut Butter Pie

Name: Chocolate Peanut Butter Pie
Prep time: 30 min
Cook time: 35 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: cooking spray; 6 tbsp butter (melted); 1 cup all purpose flour; 1/2 cup cocoa powder; 1/2 tsp salt; 1 1/2 cups granulated sugar; 3 large eggs; 1 tsp vanilla; 1/2 cup heavy cream; 20 marshmallows; 1/4 cup cocoa powder; 1 cup heavy cream; 2 tbsp powdered sugar; 2 cups peanut butter (see notes below); 2 tbsp butter (softened); 2 tbsp heavy cream; 2 cups powdered sugar