Preheat oven to 350°.
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.
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