Preheat the Oven: Preheat the oven to 375°F (190°C). Grease a 12-cup muffin tin or line with muffin liners.
Prepare the Potato Mixture: In a large bowl, combine the mashed potatoes, shredded cheddar cheese, grated Parmesan, sour cream, milk, eggs, garlic powder, salt, and pepper. Stir until the mixture is smooth and well combined. If using, fold in the chopped green onions for added flavor.
Scoop the Mixture: Using a spoon or cookie scoop, divide the mashed potato mixture evenly among the muffin cups, filling each about 3/4 full.
Add Topping: Sprinkle breadcrumbs evenly on top of each potato puff, then drizzle the melted butter over the breadcrumbs to help them crisp up as they bake.
Bake: Bake for 20-25 minutes, or until the tops are golden brown and the edges are slightly crispy.
Serve: Let the Cheesy Mashed Potato Puffs cool for a few minutes before serving.
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