Barb's - Yummy Stuffed Shells!! 1 Jar (16 oz) Alfredo 2 cups cooked chicken, shredded 2 cups cooked broccoli, chopped 1 cup shredded cheddar cheese ¼ cup shredded parmesan 21 Jumbo pasta shells, cooked (not fully) 1 ½ Cups spag sauce (optional) Pre-heat oven to 350. In a Lrg bowl, mix Alfredo, chicken, broccoli, and cheeses. Spoon Mix into pasta shells. Grease 13 x 9 baking dish with butter or spray. Spread spag sauce and place shells on pan.Cover w. foil & bake 35min until heated thru.