Preheat oven to 350°F. Lightly ... combine chocolate chips, walnuts, 1/2 teaspoon cinnamon and ... clean. Cool. Turn coffee cake out of pan and cool ... Serve crusty side up.
Prepare Crumb Topping, below and ... grated lemon peel, walnuts and half the blueberries. Spoon ... in center of cake comes out clean and Crumb ... Remove saucepan from heat.