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Preheat oven to 375°F (190°C). Grease a 12-cup muffin tin.
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In a large bowl, combine mashed potatoes, cheddar, Parmesan, eggs, milk, and green onions.
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Season with salt and pepper. Mix until just combined.
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Spoon the mixture into muffin cups, filling almost to the top.
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Bake for 20–25 minutes until golden brown and crispy around the edges.
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Let cool slightly before removing. Serve warm and enjoy!
