Preheat your oven to 350 degrees. Grease a 9×13 baking dish.
Slice your apples and toss them in a bowl with the fresh lemon juice. Layer the apples in your baking dish. Spread evenly along the pan.
Combine flour, sugar, cinnamon and oats in a bowl. Mix together.
Add the butter with a fork or hands.
Pour the mixture over the apples evenly.
Bake for 45-60 minutes.
Let cool and then add to the apple containers. Top with whipped topping or vanilla ice cream.
These make such a fun fall treat to serve at your next party or even at Thanksgiving time.