You will need one 12 muffin tin.
Preheat Oven to 350 F.
In a large bowl whisk eggs, spinach, tomato, salt, pepper and basil. Then add cheese and mix till well combined.
Prepare muffin tin by spraying with non-stick cooking spray (or you can grease them with butter). Then fill each muffin tin with the mixture until about ½ filled. Bake for 15-20 minutes until muffins set. Remove from oven and allow to cool. Muffins can be stored in containers in the refrigerator and eaten as an easy breakfast.