Preheat oven to 350 degrees fahrenheit. Prepare macaroni according to package directions; drain, rinse, and drain again. Place in large bowl and add tuna, mushroom soup, peas, 1-1/2 cups Swiss cheese, cream, and pepper; mix well. Pour into 9- x 13-inch baking dish that has been coated with cooking spray. Sprinkle remaining 1/2 cup Swiss cheese over top. Bake 20 to 25 minutes, or until heated through.