This one is a little time consuming, but it is really good. This one is from Cooking Light.
Chicken Tetrazzini
1 tblspn butter
cooking spray
1 c finely chopped onion
2/3 c finely chopped celery
1 tsp black pepper
3/4 tsp salt
3 (8 oz) packages of presliced mushrooms
1/2 c dry sherry
2/3 c flour
3 (14 oz) cans fat-free, less sodium chicken broth
2 1/4 c (9 ozs) grated fresh parmesan cheese
1/2 c (4 oz) 1/3 less fat cream cheese
7 c hot cooked vermicelli (1 c uncooked)
4 c chopped cooked chicken breast (about 1 1/2 lbs)
1 slice white bread
Preheat oven to 350. Melt butter in a large stockpot coated with cooking spray over medium-high heat. Add onion, celery, pepper, salt, and mushrooms. Saute 4 mins or until mushrooms are tender. Add sherry, cook 1 min. Lightly spoon flour into a measuring cup, level w/knife and add. Gradually add broth, stirring constantly. Bring to a boil. Reduce heat, simmer 5 minutes, stirring frequently. Remove from heat. Add 1 3/4 c parmesan cheese and cream cheese, stirring with whisk until cream cheese melts. Add the cooked pasta and chicken, stir until blended. Divide the pasta mixture between 2 (8 in square) baking dishes coated with cooking spray. Place bread in food processor, pulse 10 times or until coarse crumbs form. Combine breadcrumbs and 1/2 c parmesan cheese, and sprinkle evenly over pasta mixture. Bake at 350 for 30 minutes or until lightly browned. Remove the casseroles from oven and let stand for 15 mins. Yield 2 casseroles, 6 servings each (serving size about 1 1/3 c.)
I usually bake one right away and freeze one for later. When you reheat the frozen one be sure to let it thaw out first.