Prepare pasta shells according to package directions; drain.
Meanwhile, in large bowl combine ricotta cheese, Parmesan cheese, egg and Italian seasoning; salt and pepper to taste.
Place 1 cup pasta sauce in the bottom of an 11x7-inch baking dish. Fill shells with ricotta mixture; place in baking dish. Top with remaining pasta sauce and mozzarella cheese.
Bake, covered, in a preheated 375°F oven 30 minutes. Remove cover and continue baking 15 minutes or until cheese is bubbly.
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