01 - Preheat oven to 375°F. Grease two small oven-safe dishes or ramekins with butter.
02 - Distribute chopped spinach and diced tomato evenly between the ramekins.
03 - Crack two eggs into each ramekin, taking care to keep yolks intact if possible.
04 - Pour half of the heavy cream over each set of eggs, then season with salt, pepper, and nutmeg if desired.
05 - Sprinkle shredded cheddar cheese and finely sliced chives on top of each ramekin.
06 - Bake for 16 to 20 minutes until egg whites are set and yolks remain slightly runny; extend time for firmer yolks.
07 - Remove from oven and allow to rest for 2 minutes before serving.