Spinach Casserole - cooking recipe

Ingredients

1 (10 oz.) pkg. frozen chopped spinach, thawed
1 can cream of mushroom soup
1/4 c. butter
1 c. medium noodles
1/2 c. shredded American cheese
1/4 c. chopped onion

Preparation

Cook noodles in salted water until tender; drain.
Mix in remaining ingredients and put in slow cooker.
Cover and cook on low for 3 to 4 hours.