1. Preheat oven to 325ºF.
2. Beat eggs until light and fluffy in a large bowl.
3. Stir in the milk, tomatoes, onion, spinach, seasonings, and half of the cheese into the egg bowl.
4. Pour egg mixture into a non-stick muffin pan, should make 4 to 6 egg muffins.
5. Place the muffin pan in the hot oven and bake, uncovered, for 20-25 minutes.
6. Once cooked, remove the muffin pan from the oven, sprinkle the remaining cheese on the eggs, and bake for 3-5 minutes more.
7. Once the cheese is melted, remove the muffin pan from the oven, serve, and enjoy!
