In a small bowl whisk milk, eggs, and vanilla until smooth.
Pour egg into butter and stir.
Add baking powder, salt, and cinnamon and mix well.
Slowly add flour and mix until fully incorporated.
Fold in blueberries.
Spoon batter in to lined muffin tins, filling 2/3 full.
Bake for 18-20 minutes, rotating halfway through.
Cool on a wire rack.
Notes
*If substituting honey or maple syrup for the maple sugar, increase flour by 1/4 cup.*If substituting coconut oil for the butter, increase flour by 1/4 cup.