Preheat the oven to 350°F. Line a muffin pan with silicone or paper liners.
Mash the bananas with a fork in a large bowl.
Add eggs, maple syrup and vanilla extract.
Mix well with a whisk until combined.
Add almond flour to the bowl. Sprinkle baking powder, baking soda and salt on top. Whisk until well incorporated.
Add blueberries to the bowl.
Gently fold them into the batter with a spatula
Divide the batter between the muffin cups, about 1/4 cup each (4 tablespoons). A large ice cream scoop is very convenient for this.
Bake 28 minutes until lightly golden brown.
Let the pan stand 15 minutes on a wire rack. Remove the muffins with their liners from the pan and let them cool another 15 minutes on the wire rack. Once they are cool enough to handle, take them out of the liners by gently pressing on the sides and let them finish cooling.
These muffins can frozen and reheated for a minute in a microwave oven.