1 (16 ounce) package spaghetti
2 tablespoons butter
4 skinless, boneless chicken breast halves
1 (14.5 ounce) can chicken broth
1 (10.75 ounce) can condensed cream of mushroom soup
1/2 cup milk
1 (16 ounce) container sour cream 1 1/2 cups thinly sliced celery
1 1/2 cups sliced fresh mushrooms
2 teaspoons garlic powder 1 teaspoon onion powder salt and pepper to taste 1/2 cup dry bread crumbs
