Party Potatoes - Better Than Bouillon

Ingredients

• 6 cups frozen diced hash browns
• 3 tbsp butter
• 3 tbsp all-purpose flour
• 1 cup milk
• 2 tbsp Better Than Bouillon Roasted Garlic Base
• 2 cups sour cream
• 4 green onions, thinly sliced
• 2 cups shredded mozzarella cheese, divided
• .75 cup grated Parmesan cheese, divided