Heat oven to 350°F; grease 9x13-inch dish with butter or cooking spray.
Cook noodles per package until just al dente; they finish in oven. Drain; set aside.
Mix both soups, sour cream, milk, 1½ cups cheese, garlic powder, onion powder, salt, and pepper smooth in large bowl.
Gently fold in noodles, turkey, and peas to coat thoroughly.
Spread evenly in dish.
Toss crumbs or breadcrumbs with melted butter in small bowl to coat; scatter over casserole, then add remaining 1/2 cup cheese.
Bake uncovered 25-30 minutes until top golden and edges bubbling.
Cool about 5 minutes before serving.