Heat oven to 350°F (325°F for dark or nonstick pan). Spray bottom and sides of 13x9-inch pan with baking spray with flour.
In a medium bowl, stir together flour, 1/2 cup brown sugar, and the salt. With pastry blender or fork, cut in butter until mixture is crumbly. Set aside.
In another medium bowl, gently stir together Apple Mixture ingredients; set aside.
In a large bowl, beat Cake ingredients with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Pour into pan.
Spread apple mixture evenly over cake batter. Sprinkle Topping evenly over top.
Bake 30 to 35 minutes or until a toothpick inserted in center comes out clean. Cool completely, about 30 minutes.
Notes
Apple Pie Cake
Craving some cake, but still hungry for pie? This fruity dessert combines the best of both worlds, with apple-pie goodness blended into a moist sheet cake.