Chinese Casserole

1 - 5 ounce package noodles, cooked according to package directions
1 pound hamburger meat
1 onion, chopped
2 tablespoons butter
1/2 teaspoon salt
1/2 pound cubed cheddar cheese
1 can cream of mushroom soup
1/2 cup milk
2/3 cup chow mein noodles
1/2 cup cashews

Brown meat and onions in butter. Add all other ingredients, except the chow mein noodles and cashews. Mix well and pour into a 1 1/2 quart casserole dish. Bake at 325 degrees for 20 minutes. Add chow mein noodles and cashews and bake an additional 10 minutes.