Preheat oven to 350ºF; spray an 8-inch round baking pan with vegetable cooking spray; set aside. Rinse blueberries with cold water and pat dry with paper towels. In a medium bowl, stir sugar with cornstarch; add blueberries, toss to coat well. Spread blueberries in the prepared pan. In a medium bowl, blend muffin mix, egg and milk until batter is slightly lumpy (do not over mix); gently spread batter over berries. Bake until center springs back when gently pressed, 25 to 30 minutes. Cool 5 minutes in pan; invert onto a cake plate. Serve cake wedges with yogurt.

Yield: 6 portions