Preheat the Oven. Start by preheating your oven to 350°F. Grease a baking dish or line it with parchment paper for easy removal.
Mix Wet Ingredients. In a mixing bowl, whisk together the milk, eggs, brown sugar, maple syrup, and vanilla extract.
Combine Dry Ingredients. In another bowl, mix the oats, baking powder, and a pinch of salt.
Combine Wet and Dry Mixtures. Pour the wet ingredients into the dry mixture and stir until well combined.
Add Blueberries. Gently fold in the fresh blueberries, ensuring they're evenly distributed.
Bake to Perfection. Pour the mixture into the prepared baking dish, spreading it out evenly. Bake in the preheated oven for 30-35 minutes or until the top is golden brown and the oatmeal is set.
Serve and Enjoy. Allow the baked oatmeal to cool slightly before serving. Customize with your favorite toppings, like sliced bananas, chopped nuts, a dollop of yogurt, or a drizzle of honey.