1 (12 oz.) pkg. Velveeta shells and cheese dinner
1/3 c. chopped green pepper
1 lb. ground beef
1 (8 oz.) can pizza sauce
1 (2 1/2 oz.) jar sliced mushrooms, drained
1/2 c. chopped onion

Prepare dinner as directed on package. Add green pepper; mix lightly. Brown meat; drain. Stir in pizza sauce, mushrooms and onions. Spoon dinner mixture into 1 1/2 quart casserole. Top with beef mixture. Cover. Bake at 350 degrees for 25 to 30 minutes or until thoroughly heated.