Wash the key limes and finely scrub off the zest. You need two tablespoons. Juice the limes and collect the juice, you need 1 tablespoon.
In a mixing bowl combine the melted butter (or oil), eggs, milk, the lime zest and lime juice. Mix them for around 2 minutes until creamy.
In a separate bowl, mix sugar, sifted flour, baking powder, and a pinch of salt. SPoon this mixture into the egg-lime-mix, gently folding the components together. Grease a 9-inch cake pan with nonstick cooking spray.
Pour the lime cake batter into the pan. Bake for 30 to 35 minutes.Take the cake out of the oven and let cool.
When cooled, cut lime cake into quarters. Put one quarter into a mixing bowl with paddle attachment and add frosting. Mix until cake pop batter is smooth like play-doh.
Prepare the mini graham cracker crusts and fill with cake pop batter. Flatten and add a small well around the edges to catch the candy.
Melt ¼ of the candy melts in the microwave at 70% power for 1 minute. Stir until smooth. Slowly pour over pie and push to completely cover pie.
Once dry, decorate with some green or white candy melts.