This Blueberry Coffee Cake recipe is one of my favorites. It has a layer of blueberries and has a crunch topping. It's great for either brunch or dessert.
Combine brown sugar, ⅓ cup flour, cinnamon, oats, and cold butter in food processor and pulse until crumbly. Set aside.
In a mixing bowl, cream softened butter and sugar. Beat in eggs, one at a time. Add vanilla. Combine flour, baking powder, and salt and add to the creamed mixture, alternating with milk. Mix well taking care not to overmix.
Spoon ⅔ of the batter into a greased 9-in springform pan. Sprinkle with ⅔ of the crumb topping. Top with blueberries followed by the remaining batter. Sprinkle crumb topping over cake.
Bake for 65 - 70 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing sides of pan.