Preheat oven to 350ºF.
Whisk eggs in a bowl.
Add remaining ingredients, except for ham, and stir to combine.
Spray a muffin pan with cooking spray.
Place one slice of ham in each chamber.
Spoon about 3 tablespoons of egg mixture into each chamber so that it is 3/4 full.
Bake for about 25 minutes or until a toothpick inserted into the center comes out clean. The top will begin to brown.
Remove from oven and cool for about 10 minutes.