Preheat the Oven Preheat your oven to 180°C (360°F). Lightly grease a 19 cm (7.5-inch) round baking dish with avocado oil to prevent sticking.

Soak the Oats In a medium mixing bowl, combine the oat flakes with warm milk. Let the mixture sit for 5-10 minutes to allow the oats to soften and absorb the liquid.

Prepare the Wet Ingredients In a separate bowl, whisk the eggs until light and frothy. Add the vanilla extract and mix well.

Mix in Apples and Spices Peel and grate the apples. Fold them into the soaked oats. Sprinkle in the cinnamon and baking powder, and mix to combine. These ingredients will enhance the flavor and ensure a light, fluffy texture.

Combine Wet and Dry Mixtures Pour the egg mixture into the bowl with the oat and apple mixture. Stir until everything is well incorporated. Add the chopped nuts, reserving a few for garnish if desired.

Assemble and Bake Transfer the mixture to the prepared baking dish. Smooth the top and sprinkle the reserved nuts for an extra crunch. Bake in the preheated oven for 30-35 minutes, or until the top is golden brown and a toothpick inserted in the center comes out clean.

Cool and Serve Allow the baked oatmeal to cool for 5-10 minutes before slicing. Serve warm with a drizzle of honey, a dollop of yogurt, or a sprinkle of fresh fruit.