Sassy Mama offers up a tropical treat perfect for summertime: coconut key lime bars!
Preheat oven to 350 degrees. Spray a 9×13 pan with cooking spray. Remove 1 cup of cake mix from the cake mix box and set aside in a small bowl for the topping.
In a large bowl combine the remaining cake mix with 1 egg, melted butter and flakes coconut. Mix well, and pat into bottom of the 9×13 greased pan. Set aside.
In a mixing bowl with electric mixer, mix together the sweetened condensed milk, cream cheese, egg yolks, and key lime juice until smooth. Pour filling over crust mix in pan. In the bowl you used for the crust mix together 1 cup cake mix, chopped pecans, flaked coconut and 3 tablespoon butter. Use a fork to combine and sprinkle crumbles over the top of the custard. Bake for 45 minutes or until golden brown. Remove from oven and cook before cutting into squares.