Frost Flakes Crumb Cake . Use an offset spatula to spread the frosting out while rotating the turntable, pushing the frosting over the top edge to make an overhang. Beat eggs, milk, oil and flavorings and stir mixture into crumbs. Place in a prepared pan as to make a large cookie. Frost Flakes Crumb Cake A first memory was making the folks a crumb cake. A good use of unopened expired cereal. No granulated sugar needed in this recipe. You can cook Frost Flakes Crumb Cake using 7 ingredients and 7 steps. Here is how you cook it. Ingredients of Frost Flakes Crumb Cake You need 1 box of Frosty Flakes Cereal. It's 1 T of Baking powder. Prepare 4 of eggs. You need 1 T of Lemon flavoring. You need 1 T of Butter flavoring. You need 1/4 c of oil. Prepare 1/4 c of milk. Chilling the crumb coated cake makes all that buttercream firm up so that the layers and fillings don't shift while you're frosting ...