Nani's Mashed Potato Casserole

Ingredients (10)

• + 2 cups water add to pantry
• + ¼ cup butter add to pantry
• + 2 teaspoons instant minced onion add to pantry
• + 2 teaspoons dried parsley add to pantry
• + 1 teaspoon salt add to pantry
• + ⅛ teaspoon ground thyme add to pantry
• + 1 cup milk add to pantry
• ✓ 3 cups instant mashed potato flakes
• + ¾ cup sour cream add to pantry
• + shredded Cheddar cheese add to pantry