Gather all ingredients.
Beat eggs in a bowl, and stir in baby spinach and Parmesan cheese.
Season with onion powder, nutmeg, salt, and pepper.
Spray a small skillet with cooking spray and place over medium heat. Once warm, add in the egg mixture and cook until partially set, about 3 minutes.
Flip with a spatula, and continue cooking, 2 to 3 minutes.
Reduce heat to low and continue cooking, 2 to 3 minutes, or until omelet reaches desired doneness. Serve warm and enjoy!
