I originally made these for an Ant-Man Party, as this mini key lime pie recipe plays on an interesting character craving in the Ant-Man universe for limes and other citrus fruits after changing in size.
Meanwhile, in large bowl, beat the condensed milk and egg yolks together with a whisk. Stir in the lime juice and lime zest. Divide the mixture evenly into the cups on top of the graham cracker crust.
Bake for 9 to 11 minutes, or until the filling is set. Cool the key lime pie bites in the muffin pan on a wire rack on the counter until completely cooled before covering and transferring to the fridge to cool for at least 2 hours.