Source: Mix & Match Mama Ingredients: 1 box yellow cake mix 3/4 cup butter, melted 3 cups quick oats 1 1/2 cups peanut butter Directions: Mix the cake mix, butter and oats until a crumbly mixture forms. Press 2/3 of the mixture into a greased 9"x13" dish. Spread the peanut butter out in dollops over the top. Sprinkle the remaining cake mixture over the top and press down. (Note: try mixing the peanut butter in with the remaining 1/3 of the cake mixture and pressing over the top to see if this makes the top less crumbly.) Bake at 350 for 20 minutes.