Ingredients
Method
- In a sealable container, beat the eggs with a pinch of salt and milk until smooth. Stir in the mozzarella, spinach, tomatoes, and onions. Cover and store in the fridge overnight.
- When ready, heat a nonstick skillet over medium heat. Add butter or oil and swirl to coat.
- Shake or stir the egg mixture, then pour it into the skillet. Immediately reduce the heat to low.
- Cook until the omelet moves easily in the pan, then flip and turn off the heat.
