This recipe used Duncan Hines Classic White Cake mix with 1 cup water, 1/3 cup vegetable oil and 3 large egg whites.
For some extra texture top the cake with toasted coconut flakes. Place coconut flakes in a medium skillet over medium heat and stir occasionally until golden and toasted.
Wilton Cake Release or Wilton Bake Easy spray works great for cakes that don’t stick!
Find it online: https://www.motherthyme.com/2017/04/coconut-cream-poke-cake.html