Mix together almond flour, coconut flour, salt, baking powder, nutmeg or cinnamon, xanthan gum, Swerve granulated. Set aside.
Beat Eggs for 3 to 5 minutes.
Stream in melted butter.
Add lemon extract.
Add sour cream, lemon juice and zest.
Add dry mixture and mix just until mixed. Don't over mix.
Lightly spray baking cups.
Depending on size of cups, this recipes makes 12-14 muffins.
Fill paper liners with batter. Add blueberries to each muffin. This keeps the batter from turning blue.
Bake for 25 to 30 minutes minutes at 350 degrees F., 180 C. Muffins should be golden brown. If using tart liners that I use, bake for 15 to 20 minutes.