Onion Au Gratin

2 T butter

5 medium onions sliced thin and separated

2 c shredded cheddar cheese

1/3 c pkg biscuit mix

1/8 tsp pepper

½ c shredded cheese

Preheat oven 350. Grease 1 ½ quart casserole dish. In large pan melt butter. Add onions and cook covered over low heat. Stir in 2 c cheese, biscuit mix and pepper. Put in dish and add ½ c cheese on top. Uncover and bake 350 for 30 minutes.