2 (10 3/4 oz.) cans condensed cream of mushroom soup
1 1/3 c. milk
1/2 c. chopped onion
1 tbsp. prepared mustard
2 (16 oz.) cans sauerkraut, rinsed & drained
1 (8 oz.) pkg. med. width noodles, uncooked
1 1/2 lb. Polish sausage, cut into 1/2" pieces
2 c. shredded Swiss cheese
3/4 c. whole wheat bread crumbs
2 tbsp. melted butter

Combine soup, milk, onion and mustard in medium bowl; blend well. Spread sauerkraut in 13 x 9 inch pyrex dish. To with uncooked noodles. Spoon soup mixture evenly over top. Top with sausage, then cheese. Combine crumbs and butter and sprinkle over top. Cover tightly with foil and bake at 350 degrees for 1 hour or until noodles are tender.