Preheat oven to 350° F.

Spray 4 cups of a muffin tin with cooking spray. Crack an egg into each.

Bake in preheated oven for 10-15 minutes or until eggs have set.

Once eggs are cooked, sprinkle with grated cheese while still hot.

Toast muffins and spread each with butter. Add spinach to one half of a muffin, top with an egg and then the remaining muffin half. Repeat with remaining ingredients, making 4 sandwiches.

Serve with oranges on the side.