✔ 4 large russet potatoes (peeled and cubed)
✔ 4 tablespoons unsalted butter
✔ 1 cup sour cream
✔ ½ cup heavy cream or whole milk
✔ 1 teaspoon salt
✔ ½ teaspoon black pepper
✔ ½ teaspoon garlic powder
✔ 1 ½ cups shredded cheddar cheese (divided)
✔ ½ cup shredded mozzarella cheese
✔ ½ cup cooked and crumbled bacon (optional)
✔ ¼ cup chopped green onions or chives
✔ ½ cup panko breadcrumbs or crushed crackers (for topping, optional)
