8tablespoonschilledunsalted butter (a mixture of shortening and butter is good too)
To make the blueberry filling
Wash and pick through blueberries. Remove stem pieces. In a medium bowl, add blueberries, 1 cup sugar, flour, and lemon juice. Toss until berries are well-coated. Pour mixture in a 10x10 or 11x7-inch baking dish.
To make the topping
In a medium bowl, sift together the dry ingredients. Add butter, and cut in until mixture is coarse. Add egg and milk and mix until soft dough forms. Drop by tablespoons on top of blueberry mixture. Bake at 400°F until blueberry mixture bubbles and topping is golden brown.