With a mile-high crumb topping that's buttery flavored, sweet and bursting with brown sugar and cinnamon, Krusteaz Cinnamon Swirl Crumb Cake and Muffin Mix is a tough-to-top treat. Enjoy a warm slice for breakfast with coffee or serve it as a tasty afternoon snack. Krusteaz Cinnamon Swirl Crumb Cake and Muffin Mix is an easy-to-make staple for any pantry—and so delicious, you may be tempted to make it all the time.