Skinny Jello Poke Cake with Greek Yogurt Whipped Cream

box white cake mix

unsweetened applesauce ((1/2 cup))

egg whites

water

box Instant sugar free strawberry Jello mix ((4 servings or .30 oz box))

water

heavy whipping cream (2/3 cup)

Nonfat Greek Yogurt ((1 cup))

powdered sugar, or more to taste ((1/4 cup))

fresh berries, for serving