Cheesy Tuna Spinach Casserole Recipe - Food.com

Ingredients

• 4 ounces medium noodles
• 10 ounces frozen chopped spinach, thawed
• 1/2 cup chopped onion
• 3 tablespoons butter
• 3 tablespoons all-purpose flour
• 1/2 teaspoon dry mustard
• 1/4 teaspoon salt
• 1 1/2 cups milk
• 1 cup shredded cheddar cheese or 1 cup swiss cheese
• 6 1/2 ounces tuna, drained
• 1 (8 ounce) can water chestnuts, drained, and sliced (optional)
• 1/3 cup fine dry breadcrumb
• 1 tablespoon butter, melted