Thanksgiving Leftover Casserole

INGREDIENTS

• 3 tablespoons butter
• 2 tablespoons all-purpose flour
• 1 (12 fluid ounce) can evaporated milk
• 1 cup water
• 1/4 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 1/4 teaspoon onion powder
• 2 tablespoons butter
• 1 cup finely crushed herb-seasoned dry bread stuffing mix
• 1 cup cooked, diced turkey meat
• 1 cup shredded Cheddar cheese
• 2 cups leftover mashed potatoes