Preheat oven to 350°F. Coat 11x7-inch baking dish with nonstick cooking spray; set aside.
Prepare and drain pasta according to package directions.
Meanwhile, stir together ricotta cheese, cheese spread, chicken, ham, 1/4 cup of the Parmesan cheese, green onions and garlic pepper; mix well.
Lightly cover bottom of prepared baking dish with some of the marinara sauce. Fill shells evenly with ricotta mixture. Place shells in baking dish. Drizzle remaining marinara sauce and Alfredo sauce over shells. Sprinkle with remaining 1/4 cup Parmesan cheese. Cover loosely with foil coated with nonstick cooking spray.
Bake 20 minutes. Remove foil. Bake 10 to 20 minutes more or until heated through. Serve drizzled with additional marinara sauce and sprinkle with additional Parmesan, if desired.
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