Preheat your oven to 400°F (200°C) and lightly spray a muffin tin with non-stick cooking spray.
In a large bowl, combine the mashed potatoes, cheddar cheese, Parmesan cheese, eggs, flour, chives, garlic powder, salt, and pepper. Mix until everything is well combined.
Spoon the potato mixture into the prepared muffin tin, filling each cup about 3/4 full.
Bake in the preheated oven for 20-25 minutes, or until the tops are golden brown and crispy.
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