Ingredients
Method
- Preheat oven to 375°F. Butter a 9x13 pan.
- Sauté mushrooms and onion in butter until soft, about 5 minutes.
- Stir in flour and cook 1 minute. Slowly whisk in milk and soup until thickened.
- Add tuna, peas, salt, and pepper. Fold in cooked noodles and half the Swiss.
- Pour into pan, top with remaining Swiss and breadcrumbs if using.
- Bake 20–25 minutes until bubbly and golden.