1. Place berries, sugar, lemon juice, lemon zest, cinnamon, and cornstarch in a 9x9 casserole dish. Stir to coat the berries evenly with the sugar. Let sit for 30 minutes.
2
2. Preheat oven to 350°F. In a medium sized bowl, whisk together 3 tablespoons of sugar, the flour, baking powder, and salt. Cut the butter in with a pastry blender or fork (or even your fingers) until the mixture resembles coarse crumbs. Use a wooden spoon to stir in the egg and milk until the batter is just moistened.
3
3. Taking large spoonfuls, drop the batter mixture over the berries. Place in the oven and bake for 30 minutes or until the berry mixture is bubbly and the topping is nicely browned.
