Stove Top Hashbrown Casserole

Bahan-bahan (6 porsi)

• 2 tablespoons olive oil
• 6 cups frozen diced hash browns
• ½ onion (diced)
• 2 cloves garlic (minced)
• 1 ½ teaspoons chopped fresh parsley (chopped)
• ½ teaspoon dry mustard powder
• salt and pepper to taste
• 1 ½ tablespoons all-purpose flour
• 1 ½ cups milk
• ½ cup sour cream
• 2 cups shredded sharp cheddar cheese (divided)