Grandma's Secret Tip

When Grandma wanted a mousselike dessert with a crumb topping, she simply reversed the layers of this bar cookie. After pouring the pumpkin mixture into a well-greased baking pan, she crumbled the cake mix mixture on the top, then baked as directed. She checked whether it was set in the center, and, if not, she baked it for 10 minutes longer. She let it cool, then chilled the dessert and spooned it into dessert cups.