Preheat oven to 375˚F.
Coat 12 muffin cups with cooking spray. Arrange 1 slice of ham in each cup, molding it to the shape of the cup. The ham may rise out of the edges of the cup. Spread 1 teaspoon of salsa in the bottom of each cup.
Break 1 egg into each ham-lined cup. Top with another teaspoon of salsa, and 2 teaspoons shredded cheddar cheese
Bake until the cheese melts and the eggs are set, about 20 minutes.
Tip: Replace the salsa in this recipe with finely chopped fresh vegetables of your choice - onions, peppers, tomatoes, or mushrooms, for example, work nicely. For a more intense flavor, sauté vegetables beforehand.