Heat oven to 425°F. Line 15x10x1-inch jelly roll pan with foil; spray with cooking spray. In large bowl, beat Bisquick™ mix, milk, eggs, granulated sugar and melted butter with whisk until blended. Stir in 1 tablespoon of the lemon zest. Spread in pan. Top with blueberries. Bake 6 minutes.