Place 10 mini cupcake liners on a baking sheet and spray each evenly with nonstick cooking spray.
Place peanut butter in a small microwave safe baking dish. Microwave 10 seconds or until slightly melted and loosened.
Spread one teaspoon melted chocolate evenly over each cupcake liner. Top evenly with 2 teaspoons melted peanut butter, spreading over chocolate, and top with remaining chocolate. Cover evenly with banana slices. Place in the freezer for at least 4 hours or overnight. Peel off cupcake liners and serve immediately or freeze until ready to use.
These make a great snack or dessert for kids and adults!