WW Chicken or Turkey Tettrazini

10 oz uncooked vermicelli
2 tsp veg oil
1 lb turkey breast cutlets or chicken breasts
3/4 tsp onion powder
1/2 tsp salt, divided
1/4 tsp pepper, divided
2 tbsp dry sherry or white wine
2 (8 oz each) pkg sliced mushrooms
3/4 c frozen peas, thawed
3/4 c FF milk
2/3 c FF sour cream
1/3 c grated parm
1 can RF cream of mushroom
cooking spray
1/3 c dry breadcrumbs
2 tbsp melted butter
sauteed celery and onion

Preheat oven to 450. Cook pasta according to pkg directions. Drain. Heat a little butter or oil in a skillet, saute a little bit of onion and celery (the recipe is weird, it doesn't specify an amount, nor does it have the oil or butter needed for this step listed in the ingredients. I just use 2-3 stalks of celery and about 1/2 an onion, diced). Put celery and onion in a bowl and set aside. Heat oil on med-hi. Sprinkle turkey with 1/2 tsp onion powder, 1/4 tsp salt, and 1/8 tsp pepper. Cook in oil til done, remove from pan. Add1/4 tsp onion powder, sherry, and mushrooms to pan. Cover and cook til tender, about 4 minutes. Combine peas, milk, sour cream, cheese, and soup in large bowl. Chop turkey (or chicken). Add 1/4 tsp salt, 1/8 tsp pepper, pasta, turkey, celery and onion, and mushroom mixture to soup mixture, tossing gently to combine. Spoon into greased 13x9 baking dish. Combine butter and breadcrumbs; sprinkle on top. Bake at 450 for 12 minutes or til bubbly and hot.