1/3 cup Pillsbury™ Creamy Supreme® Caramel Apple Flavored Frosting
1/4 teaspoon coarse sea salt
HEAT oven to 350°F. Coat 9-inch square baking pan with no-stick cooking spray. Combine cake mix, oats, cinnamon, butter and egg in large bowl with fork until mixture resembles coarse crumbs. Reserve 1 cup crumbs for topping. Press remaining mixture evenly into bottom of prepared pan.
BAKE 15 minutes or until edges begin to brown. Place apples evenly over crust. Top with reserved crumb mixture. Bake an additional 23 to 26 minutes or until crumb topping begin to brown. Remove to wire rack to cool completely.
HEAT frosting in small microwave-safe bowl on HIGH for 15 seconds. Stir. Drizzle evenly over bars. Sprinkle with salt.