In a mixing bowl, warm your peanut butter and honey in the microwave for about 20-30 seconds. Stir mixture and add apple slices and 1/2 a teaspoon of cinnamon.
Spay a small baking dish with cooking spray and place the apple mixture evenly in the dish.
In a small bowl combine the oats, flour, sugar, and the remaining cinnamon. Mix well, then cut in the butter so the mixture is course and the butter is evenly distributed.
Sprinkle the topping over the apples.
Bake 30-40 minutes until the apples are tender. (Cooking time will depend on how thinly you slice the apples)
Serve with ice cream.
Notes
You don't have to warm the peanut butter and honey if you don't want to--I just think this makes it easier to fully coat the apple slices.