Preheat oven to 350. Line 8 holes of a standard muffin tin with paper liners. Spray with cooking spray.
Combine all of the ingredients in a medium bowl. Stir until smooth. Stir in any desired mix-ins. Divide between 8 muffin tins.
Bake for 25-30 minutes until the muffins are lightly browned around the edges and feel firm when pressed with your finger.
Nutrition: The nutrition facts are for one muffin. There are 6.4 NET carbs per muffin without mix-ins. If you add mix-ins the nutrition facts will change. Mix-Ins: If you add in nuts, berries, or chocolate chips you may get more than 8 muffins. Only fill the liners ⅔ full.Notes on Sweeteners: