Preheat the oven to 350°F and spray muffin pan with cooking spray/use silicone muffin liners. Set aside.
In a blender place (or use mixer or hand mixer) lemon extract, eggs, banana (can be un-mashed if using blender), lemon zest, the juice from the lemon that was zested, baking powder and salt. Blend on medium-high speed until well combined.
Next add almond flour and blend until well combined.
Next fold in the blueberries until well combined.
Divide batter evenly between the 12 muffins.
Bake for about 25-27 minutes or until the tops of the cakes are golden brown and a toothpick inserted comes out clean.
Remove muffins from the oven, let cool for 10-20 minutes in the pans before carefully removing from the pans to cool completely on a wire cooling rack.
Enjoy! Store leftovers in the fridge for 1 week.