Preheat the OvenPreheat your oven to 400°F (200°C).Grease a mini muffin tin or standard muffin tin with butter or cooking spray to prevent sticking.
Mix the IngredientsIn a large mixing bowl, combine the mashed potatoes, cheddar cheese, Parmesan cheese, eggs, milk, green onions, garlic powder, salt, and pepper.Mix thoroughly until all ingredients are well combined. The mixture should be thick and creamy.
Fill the Muffin TinScoop the potato mixture into the prepared muffin tin, filling each cup to the top. Use a spoon or small ice cream scoop to ensure even portions.
Bake to Golden PerfectionPlace the muffin tin in the preheated oven and bake for 20–25 minutes, or until the tops are golden brown and slightly crispy.For an extra cheesy finish, sprinkle a little more cheddar or Parmesan on top during the last 5 minutes of baking.
Cool and ServeAllow the puffs to cool in the muffin tin for 5 minutes before carefully removing them with a fork or small spatula.Serve warm for the best texture and flavor.
