Preheat oven: Preheat oven to 350°F (175°C). Grease and flour a 9×9 inch baking pan.
Combine dry ingredients: In a large bowl, whisk together oats, flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
Combine wet ingredients: In a separate bowl, whisk together brown sugar, granulated sugar, melted butter, egg, and vanilla extract.
Combine wet and dry: Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
Fold in apples and walnuts: Gently fold in the chopped apples and walnuts (if using).
Bake: Pour the batter into the prepared pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Cool: Let the cake cool in the pan for 10 minutes before inverting onto a wire rack to cool completely.
Tips & Variations:
Spice it Up: Add a pinch of cloves or ginger to the batter for extra warmth.
Make it Moist: Add a tablespoon of milk or apple cider to the batter.
Topping: Drizzle with a simple glaze made from powdered sugar and a touch of lemon juice.
Fruit Variations: Use pears, peaches, or berries instead of apples.
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