Dirt Bike Cake for my 4 year old. I used a 11x15 casserole pan and also baked some cake in a bread pan to use for the mounds. The dirt is crushed up peanut butter cups (tastier than graham crackers and doesn't get soggy!) I added chocolate rocks I bought off amazon, chocolate donuts for the tire borders, and piped on some grass. He loved the cake but I wish the dirt bikes were smaller, they looked ridiculously huge on the cake!