Step 1

Preheat the oven to 350 degrees F. Grease an 8x8-inch baking pan with nonstick cooking spray and set aside.

Step 2

In a large bowl, mix together the oats, cinnamon, baking powder, and salt.

Step 3

In a medium bowl, whisk together the milk, maple syrup, melted butter, egg, and vanilla. Pour the wet ingredients over the oat mixture and stir until combined. Gently fold in 1 cup of the blueberries.

Step 4

Pour the mixture into the prepared pan. Sprinkle the remaining blueberries and chopped nuts on top of the oats, if using.

Step 5

Bake for 40 minutes, until the top is golden and oatmeal is set. Let cool for 5 minutes and serve warm.