PREHEAT oven to 350F and line a baking sheet with parchment paper.
ADD all of the key lime popsicle ingredients to a blender and puree until smooth.
POUR the batter in the popsicle mold until it is about ¾ of the way full.
PLACE in the freezer for about 45-60 minutes while you prepare the crust.
ADD the cake mix and palm shortening to a bowl and use a fork to mix and create a coarse meal.
ADD the rest of the ingredients and combine until mixture forms into a ball.
PLACE the crust on the parchment paper and use your hands to spread the dough about 1/8 inch thick.
BAKE for 10 minutes and let cool completely. Break in to large pieces and run through the food processor or blender and pulse until it reaches a coarse meal.
REMOVE the popsicles from the freezer and add 1-2 tablespoons of crust on top.
PACK the crust in with your fingers gently and then carefully add the popsicle stick.
FREEZE for 4-6 hours or until frozen. Carefully run under some warm water to loosen from the mold. Eat immediately or store in the freezer.