Preheat oven to 325 F
Spray a 24 count mini muffin tin thoroughly with non-stick cooking spray
In a mixing bowl, combine crushed graham crackers and melted butter and stir
Scoop a small spoonful of crumbs into each muffin tin, pressing down until firm with your fingers
Bake for 8-9 minutes
In a separate bow, beat cream cheese, egg, sugar, key lime juice + zest and vanilla with a mixer until well combined
Fill the remainder of the muffin tins with cream cheese mixture and bake for 20-23 minutes
Remove from oven and carefully run a butter knife around the edges of each pie so that they do not stick
Remove from muffin tin and allow to cool
Top each key lime pie with cool whip, graham cracker crumbs and a lime slice and serve chilled
Enjoy!