1½ cups sugar
1 cup (2 sticks) butter, softened
½ t baking powder
1 t vanilla extract
3 cups flour
1 21 oz. can apple pie filling
½ t cinnamon, divided
4 T oats
½ cup powdered sugar
1 T milk
Preheat oven to 350º degrees.
In large mixing bowl, beat together butter and sugar until light and fluffy. Add in vanilla and eggs one at a time until completely mixed.
Mix in flour and baking powder until completely incorporated.
Spread 2/3 of the batter into 13×9 baking pan sprayed with non-stick cooking spray. Reserve 1/3 batter for topping.
Pour apple pie filling on top of batter, smooth to edges & sprinkle 1/4 t of cinnamon over apple layer.
Mix oats and remaining 1/4 t cinnamon into reserved batter.
Spoon in dollops onto apple layer.
Bake 45 minutes.
Mix glaze ingredients together and drizzle while cake is still warm.