Preheat oven to 375 degrees. Place coconut oil in an 8x8-inch baking dish and place into the oven for 3-4 minutes or until melted; remove and set aside.
Meanwhile, in a medium bowl, whisk to combine the oats, baking powder, cinnamon, and salt; transfer to the baking dish and mix well, distributing the coconut oil throughout the oats. Add the pecans, coconut, and blueberries; mix well.
In the bowl used to mix the oats, whisk to combine the egg, maple syrup, vanilla extract, and almond milk; slowly pour the mixture over the oats.
If desired, cover and refrigerate overnight. Bake the oatmeal, uncovered, for 35-40 minutes or until set and just beginning to brown. Serve warm.