From Scratch Tuna Noodle Casserole

Directions

1. 1
   Preheat oven to 375F.Cook noodles, drain, and set aside.Meanwhile, combine breadcrumbs with 1 tablespoon melted butter.Set aside.For sauce, in a medium saucepan cook onion and celery in 1/4 cup butter until softened.Stir in flour, salt, mustard powder, and black pepper.
2. 2
   Add milk all at once.
3. 3
   Whisk until slightly thickened and bubbly.
4. 4
   Combine sauce, tuna, cheese, roasted pepper or pimiento, and cooked noodles.
5. 5
   Transfer to a 1 1/2 quart casserole dish.
6. 6
   Sprinkle with breadcrumb mixture.
7. 7
   Bake, uncovered, for 20-25 minutes until bubbly and breadcrumbs are golden brown.