IT BEGINS AS CEREAL AND ENDS AS PIE DEAR MELBA: My kids are Rice Krispie Treat fanatics. They probably learned this from their mother. RICE KRISPIE TREAT PIE Crust • 1/3 cup butter • 1 package (10 ounces) miniature marshmallows • 6 cups Rice Krispies In saucepan, melt butter and marshmallows and pour over cereal and stir together. Use glass cup to press mixture into 2 buttered pie pans. Let set up while mixing the filling.