Melt a ¼ cup of butter and 4 cups of mini marshmallows for a no-fail base. Then mix in up to 8 cups of whatever cereal you have on hand. Then press into a 13 x 9 pan prepared with nonstick cooking spray. No matter which you swap in, you’re guaranteed a delicious treat. For a pro-level snack, try mixing two kinds of cereal. You can even add nuts, dried fruit or your favorite candies.