1 (7 1/4 oz.) pkg. macaroni & cheese dinner
1/2 c. chopped onions
1/4 c. chopped green pepper
2 tbsp. butter
1 can condensed cream of celery soup
1 (6 1/2 oz.) can tuna, drained, flaked
1/2 c. chopped pimiento
13 oz. can mushrooms, drained

Prepare dinner as directed, except 3/4 cup of milk. Saute onion and green pepper in butter until tender. Add to prepared dinner with remaining ingredients; mix well. Pour into 1 1/2 quart casserole. Bake at 350 degrees for 30 minutes.