i have a similar recipe, so maybe you can compare notes and find your missing instructions?
1 box jumbo shells, cooked and well-drained
2 c. chopped chicken
1 sm. box stuffing mix
6 oz. jack cheese
1/2 c. hellmann's mayo
-2 tbsp. sliced scallions
2 cans cream-of broccoli, asparagus, chicken or musroom soup
1 8-oz. pkg. grated mozzarella
preheat oven to 350. prepare stuffing. add chicken, jack cheese, mayo and scallions. stuff pasta shells and arrange in a greased 9x13 pyrex baking dish. mix cream-of soup w/ 1 can of whole or lowfat milk. pour over the shells; bake for 20 minutes. sprinkle w/ mozzarella and bake for another 12 minutes.
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