Pre-heat oven to 350ºF and grease an 8" x 8" oven-safe dish. If desired, prepare a parchment sling by cutting out a piece of parchment paper slightly longer than the pan and placing it inside for easy removal of the baked oatmeal.
To the wet ingredients add oats, blueberries, chia, baking powder, and salt and mix until fully combined.
Pour into prepared dish and bake for 40 minutes, until the center is just barely firm.
Scoop and serve warm as is or with almond milk, or cool and slice into 9 square portions.
You can reduce the amount of maple syrup in the recipe to 1/4 of a cup if you prefer a less sweet version.
Maple extract can be commonly found at most grocery stores. We obviously recommend only buying an all natural extract, and skipping it if it's artificially flavored.
You can use frozen blueberries. Do not let them thaw, or they will streak the whole oatmeal bake purple. You may need an extra minute or two for the total baking time, make sure to follow the instructions about the center being just about cooked through.