Preheat oven to 350. Rinse blueberries and drain. Place in bottom of 10 x 6 glass baking dish; sprinkle with lemon juice. Mix next 4 ingredients with a fork until it resembles coarse corn meal (There will be some lumps in it). Distribute flour mixture over blueberries; drizzle top with butter. Combine cinnamon and sugar; sprinkle on top.
Bask 35-40 minutes. Do not overbake. Serve with ice cream, coffee cream, or half and half. Serves 6-8.
Servings 6