Blueberry Betty
["1 qt. blueberries (fresh or frozen)", "1 Tbsp. lemon juice", "1/2 tsp. cinnamon", "1 c. all-purpose flour", "1 c. sugar", "1/2 c. (1 stick) cold butter or margarine, cut into 6 pieces"]
["For serving:", "vanilla ice cream or frozen yogurt or sweetened whipped cream can be used."]
["blueberries", "lemon juice", "cinnamon", "flour", "sugar", "cold butter"]