Preheat your oven to 175°C (350°F). Grease a 9x9-inch baking dish or line it with parchment paper for easier removal.
In a large mixing bowl, combine the oats, almond milk, maple syrup, cinnamon, nutmeg, vanilla extract, salt, and baking powder. Stir well until all ingredients are evenly mixed.
Gently fold in the diced apples and chopped walnuts, mixing softly to distribute them evenly in the oat mixture.
Pour the oat mixture into the prepared baking dish and spread it evenly.
Bake the casserole in the preheated oven for 30-35 minutes, or until the edges are golden brown and the center is set. A toothpick inserted in the center should come out clean.
Remove from the oven and let it cool slightly before cutting into square pieces.
Serve warm, optionally drizzled with additional maple syrup or a sprinkle of cinnamon for extra flavor.
Notizen
Serve warm, optionally topped with additional maple syrup or a sprinkle of cinnamon.