1 1/2 qt. shredded lettuce
2 c. chopped tomatoes
2 c. mushroom slices
1 (10 oz.) pkg. frozen peas, thawed & drained
4 oz. mild cheddar cheese
1 c. red onion rings
2 c. salad dressing

Layer in 2 quart bowl first 6 ingredients. Spread salad dressing over onions, sealing to side of bowl. Chill several hours or overnight. Garnish with bacon or shredded cheese.