Mix together cake mix, 1/2 Tbsp lime zest, key lime juice, half and half and eggs.

Batter will be thicker. Pour batter into a greased 9x13 baking pan.

Bake at 350 degrees  for 28-32 minutes, until the cake springs back when lightly touched. Remove from the oven and cool completely.

Crumble cake into small, even pieces, placing crumbs in a large bowl.

With the back of a spoon, mix together cake crumbles with the frosting, sweetened condensed milk, and 2 Tbsp lime zest until a thick “dough” consistency forms, making it easy to shape into a cake bite.

Shape cake bites, evenly sized and cool for 1-2 hours in the refrigerator, or 20 minutes in the freezer. Dip into white melting chocolate. Top with crushed graham crackers.