Preheat oven to 350F degrees
Spray 13 x 9 baking pan with nonstick cooking spray with flour
In a medium bowl, combine cake mix with 3/4 cups malted milk powder.
Add in eggs, oil and water and stir until combined.
Pour batter in baking pan.
Bake for about 38-40 minutes (until a toothpick inserted in the middle comes out clean)
Allow cake to cool completely before making topping.
For the topping
In a medium bowl, combine whipped topping with 3/4 cup malted milk powder.
Stir until completely incorporated and no longer grainy.
Spread topping on top of cooled cake.
Put one cup of malted milk balls into a ziploc bag and zip it up.
Pound with a rolling pin (or other hard object) to crush Whoppers.