Description: This addition of sour cream in this coffee cake makes it so moist and delicious! This is one of my all-time favorite cake recipes, I have even made this cake with fresh blueberries adding in 1 tsp almond extract to replace the vanilla, or you can even add it in when using apples --- this cake is fantastic without the topping and just used as a white cake --- I usually double the brown sugar topping and spread half of the cake batter in the pan then sprinkle half of the topping then top with remaining batter, the batter will not really cover the topping mix if you are using a 13x9-inch pan but not to worry it will bake together just fine and besides you will be sprinkling the remaining batter on top anyway! --- serve this with whipped cream or ice cream, *SO* delicious!