Philly Cheesesteak casserole

This is all that was left of the dinner I made tonight. I wish I could emphasize how paramount this is. Almost NEVER do I make a casserole in a 9x13 pan and have it all be gone. I am thinking about licking the pan after putting up this post. :)

Philly Cheesesteak Casserole
3 C uncooked egg noodles
1 lb boneless beef sirloin
1 lg. onion, chopped
1 small bell pepper, chopped
1 can fat free beef broth
1/4 C whole wheat flour
1/2 C half and half (you can use fat free but I didn't have that)
1 T Dijon mustard
8 slices provolone cheese

Heat oven to 350 degrees.
Cook and drain noodles.
Trim excess fat from meat and cut into very thin slices. Heat a nonstick skillet and cook beef until browned.
Stir in onion and pepper. Cook for 2 min and then spoon into the baking dish.
In a medium bowl mix beef broth and flour until smooth. Put it in the skillet and heat until it thickens. Remove from heat and stir in half and half and mustard. Spoon over beef mixture. Stir in cooked noodles
Top with the slices of provolone.
Bake for 30-40 minutes until cheese is melted and it is heated through.