1 pkg. (10 oz.) frozen spinach
1 lb. ground beef
1 can (4 oz.) mushroom pieces, drained
10 3/4 oz. can cream of mushroom soup
Salt and pepper

Cook spinach as directed on package. Crumble ground beef and cook on High for 3 to 5 minutes. Stir, then combine spinach, mushroom soup, cheese and seasonings. Return to oven and heat on high until hot through.