On the rare occasion that I buy sour cream, I really need to use it before it goes bad. That means a lot of cake and muffins are baked in my house, then frozen for future breakfasts. I mean, I don’t want to waste a perfectly good ingredient. In this case, I decided to bake coffee cake, because it’s classic New York cuisine and easy to make for breakfast. I found a recipe in an old issue of Bon Appetit I had lying around, and it was perfect! A thick crumb topping and a nice moist cake.