Preheat oven to 375 degrees, and coat an 8x11 baking dish with cooking spray.
Combine the peanut butter and brown rice syrup in a small pot over low heat, stirring often as the mixture melts.
Meanwhile, combine the oats and chia seeds in a mixing bowl.
Add the mashed banana, almond milk, cinnamon, salt, and vanilla to the melted peanut butter mixture, stirring to combine well.
Pour the peanut butter mixture over the oats/chia seeds. Mix together with a wooden spoon. Fold in the blueberries.
Transfer the oat mixture to the baking dish, spreading evenly and pressing down into the dish with the wooden spoon.
Bake for 20 minutes, or until the oats are lightly browned and blueberries are bubbly. Allow to slightly cool before cutting into bars.
Notes
*While none of these ingredients contain gluten, Farmer Direct Co-op regular rolled oats are not certified gluten free, as they are manufactured in a place where wheat is present.