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Preheat the oven to 375 degrees.
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Spray 2 mini muffin tins (each with 24 cups) with nonstick spray.
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Whisk the eggs, milk, pepper, and salt in a large bowl to blend well.
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Stir in the ham, cheese, and parsley.
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Fill prepared muffin cups almost to the top with the egg mixture.
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Bake until the egg mixture puffs and is just set in the center, about 10 to 15 minutes. Using a rubber spatula, loosen the frittatas from the muffin cups and slide the frittatas onto a platter.