Ingredients

• 1 (32 ounce) package frozen cubed hash browns, thawed, or 7 cups cubed peeled potatoes
• 1 (15 ounce) can reduced-sodium condensed cream of chicken soup (such as healthy choice)
• 1 cup reduced-fat sour cream
• 1 cup thinly sliced scallions, plus more for garnish
• 1 teaspoon garlic powder
• 1 ½ cups shredded part-skim mozzarella cheese, divided
• 1 ½ cups shredded sharp cheddar cheese, divided