1. Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Boil the cubed potatoes in a large pot of salted water until they’re fork-tender, about 15-20 minutes.
3. Drain the potatoes and return them to the pot. Add the butter, sour cream, and milk, mashing until smooth.
4. Stir in 1 1/2 cups of the cheddar cheese, garlic powder, salt, and pepper. Mix until all ingredients are well combined. Taste and adjust seasonings if needed.
5. Transfer the mashed potatoes to the prepared baking dish, spreading them evenly.
6. Sprinkle the remaining 1/2 cup of cheese over the top.
7. Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and slightly golden.
8. Garnish with chopped chives before serving, if desired.

As you mash the potatoes, let the rhythm transport you to the bustling kitchen of my childhood, where laughter and stories filled the air. Cooking isn’t just about the end result; it’s about the journey, the memories you create along the way.