Steps
1. Preheat the oven to 350°F (175°C).
2. Peel and core the apple, then slice it into thin wedges.
3. In a small bowl, mix together the oats, almond flour, brown sugar, and cinnamon.
4. Add the diced butter to the oat mixture and use your fingers to rub it in until the mixture resembles coarse crumbs.
5. Place the apple slices in a single layer in a small baking dish.
6. Sprinkle the oat mixture evenly over the apples.
7. Bake for 25-30 minutes, or until the apples are tender and the topping is golden brown.
8. Serve warm and enjoy!