1 box macaroni and cheese
3/4 c. milk
1/4 c. butter
1/2 c. green pepper
1/2 c. chopped onion
1 tbsp. butter
1 can cream of celery soup
1 can tuna
14 oz. mushrooms

Cook macaroni. Saute onion and green pepper in 1 tablespoon butter and cheese packet from box. Add rest of ingredients and heat in microwave 5 to 10 minutes until heated through.