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Preheat oven to 350 degrees then spray an 8x8" baking pan with nonstick spray and set aside.
Add 1 cup old fashioned oats to a food processor or blender then process until oats have turned into flour. Set aside. (Alternatively you could use a scant cup oat flour.)
Add milk, mashed banana, honey, coconut oil, egg, and vanilla to a large bowl then whisk to combine. (Coconut oil might solidify a bit but it's fine and the oil will melt right back down in the oven.) Add remaining 1-1/2 cups oats, oat flour, cinnamon, baking powder, and salt then stir to combine. Fold in blueberries then pour batter into prepared baking pan.
Bake for 35-40 minutes or until the edges are golden brown and the center has set. Cool before slicing into bars then store in the refrigerator, or individually wrap bars in saran wrap and freeze.