Preheat the oven to 350 degrees F. Grease an 8x8 square baking dish and set aside.
In a medium bowl, mix together the oats, coconut, brown sugar, baking powder, salt, and cinnamon.
In another medium bowl, whisk together the milk, egg, coconut oil, and vanilla. The coconut oil might get a little lumpy, but that is ok. It will melt when baking.
Arrange two-thirds of the blueberries on the bottom of the prepared baking dish. Pour the oat mixture evenly over the berries. Pour the milk mixture over the oats. Gently shake the baking dish to make sure the milk covers the oats evenly. Sprinkle the remaining blueberries on top of the oats.
Bake for 40 minutes, until the top is golden and oatmeal is set. Let cool for 5 minutes and serve warm.
Note-this baked oatmeal is great reheated in the microwave. We like to add a splash of milk!