Heat a large nonstick skillet coated with cooking spray over medium-high heat. Add onion; sauté 2 minutes or until crisp-tender. Add ham; sauté 3 minutes. Remove from heat; cool 5 minutes. Combine remaining ingredients in a large bowl; stir with a whisk. Add ham mixture, stirring with a whisk. Spoon mixture into 24 miniature muffin cups coated with cooking spray. Bake at 350° for 20 minutes or until set.
Susan Caldwell is the mom of two and owner of Lil' Chef, a cooking studio for kids in north Raleigh. She offers recipes twice a month here on Go Ask Mom.