In a medium bowl, combine the graham cracker crumbs, granulated sugar, and melted butter until fully mixed.
Press the crust mixture firmly into the bottoms of a mini muffin tin or mini cheesecake pan.
Refrigerate the crusts for at least 30 minutes until firm.
In a large mixing bowl, beat the softened cream cheese, creamy peanut butter, powdered sugar, and vanilla extract until smooth and creamy.
Fold the whipped cream gently into the peanut butter mixture until light and fluffy.
Spoon the No-Bake Mini Peanut Butter Banana Cheesecake filling evenly over the chilled crusts.
Add a layer of thin banana slices on top of the filling.
Refrigerate the mini cheesecakes for at least 2 hours until fully set.
Before serving, garnish with whipped cream, banana slices, and a drizzle of peanut butter if desired.