Preheat the oven to 375 degrees Fahrenheit and spray a 9x9 baking dish with non-stick cooking spray.
Mash the banana in a large mixing bowl. Stir in the milk, maple syrup or honey, eggs, melted butter, brown sugar, and vanilla extract until combined.
Stir in the oats, baking powder, cinnamon, and salt until just combined.
Gently fold in the blueberries and half of the chopped pecans.
Pour the mixture into the prepared baking dish. Sprinkle the remaining pecans on top and gently press them into the mixture.
Bake for 42–45 minutes, until golden brown.
Let cool for about 10 minutes before serving.
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Notes
You can easily use any type of berries and nuts that you prefer for this easy baked oatmeal recipe. This recipe is great served as is, topped with yogurt or additional syrup. Refrigerate any leftovers in an airtight container for up to 4-5 days. Microwave the individual servings before serving.