1Spray 13x9-inch (3-quart) glass baking dish with cooking spray. In medium bowl, stir all filling ingredients until well blended; set aside.
2In medium bowl, stir all batter ingredients with wire whisk or fork until well blended. Pour batter into baking dish. Pour filling evenly over batter. Cover; refrigerate at least 8 hours or overnight.
3Heat oven to 325°F. Uncover baking dish; bake 55 to 60 minutes or until golden brown and center is set. Let stand 10 minutes before serving. Top servings with sour cream and strawberry preserves.