- 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.