1 Preheat the oven to 350 degrees. 2 Add the apples to a glass baking dish and toss with cinnamon and brown sugar. Cover with foil. Bake for 20 minutes. 3 Meanwhile, mix together the oats, brown sugar, cinnamon and salt. Mix together the egg, milk, and vanilla extract. 4 Remove the apples and mix in the oat mixture. Then pour milk and egg mixture over top and give it one quick stir. 5 Bake for 30 minutes.