The best homemade crumb cake this cinnamon coffee cake recipe is moist buttery and full of cinnamon flavor this is the best recipe for cinnamon crumb cake out there! Cinnamon Crumb Cake, Crumb Coffee Cakes, Crumb Cakes, Buttermilk Coffee Cake, Coffe Cake, Coffee Cake Muffins, Sour Cream Coffee Cake, Buttermilk Recipes, Cupcakes