01 - Preheat oven to 350°F (175°C). Lightly grease a 9x9 inch baking dish with butter or oil.
02 - In a large mixing bowl, blend rolled oats, chopped nuts, baking powder, ground cinnamon, nutmeg, and salt until evenly distributed.
03 - In a separate bowl, whisk together milk, eggs, melted butter or coconut oil, maple syrup or honey, and vanilla extract until fully combined.
04 - Pour wet mixture into the bowl with dry ingredients and stir until just integrated. Gently fold in diced apples and optional dried fruit.
05 - Spoon the blended oat mixture into the prepared baking dish, spreading it out evenly across the surface.
06 - Bake in the oven for 35 minutes, or until the top is golden brown and the bake has set.
07 - Remove from oven and allow to cool for at least 5 minutes before slicing. Serve warm, optionally with additional milk or yogurt.