Preheat oven to 375°F. Combine ... until frothy; beat in sugar and butter. Beat until ... or the coffee cake will be tough and dry ... set (about 25-30 minutes).
Preheat oven to 350°F. Grease ... tapping out excess. In a large bowl, whisk together ... not overmix. Bake cake in a preheated 350°F oven ... removing cake from pan.
Grease an 8-inch square baking dish. Toss the blueberries in the cinnamon and sprinkle with ... bake until the cake tests done (about 45-50 minutes). ... syrup or whipped cream.