Cook spaghetti according to package directions. Meanwhile, in a large bowl, combine the Alfredo sauce, peas, turkey, mushrooms, cheeses, wine and onion powder. Drain spaghetti. Add to sauce mixture; toss to coat. Transfer to a greased 8-in. square baking dish. Sprinkle with onions and paprika.
Cover and bake at 350° until heated through, 30-35 minutes.