Preheat your oven to 400°F. Line a baking sheet with parchment paper. Lightly grease it if needed. This helps prevent sticking and gives your Mashed Potato Cheese Puffs a nice golden bottom.

In a large mixing bowl, add mashed potatoes, shredded cheddar cheese, and grated Parmesan. Stir everything gently until well combined. Make sure the mixture looks smooth and evenly mixed.

Crack the egg into the bowl. Add garlic powder, salt, and black pepper. Mix well until everything forms a thick, creamy mixture. The egg helps bind everything together nicely.

Sprinkle in the flour and mix again. If using parsley, add it now. The mixture should feel soft but hold its shape. Add a little more flour if it feels too sticky.

Use a spoon or cookie scoop to form small balls. Place them on the prepared baking sheet. Leave space between each puff so they cook evenly and get crispy.

Lightly brush each puff with melted butter. This step gives a beautiful golden color. It also adds a rich flavor that makes the puffs extra delicious.

Place the tray in the oven and bake for 20 to 25 minutes. The puffs should turn golden brown and slightly crisp on the outside. The smell will fill your kitchen.

Remove from the oven and let them cool for a few minutes. Serve warm for the best taste. The inside will be soft, cheesy, and very comforting.