Triple-Decker Fudgy Chocolate Waffle Pie

chocolate cake mix + ingredients called for ((eggs, vegetable oil, water))

package (3.4 ounces) vanilla instant pudding mix (dry)

milk (1% milk fat or higher)

container (8 ounces) frozen whipped topping (completely thawed)

Fresh berries (I used raspberries)

Chocolate bar (optional)