In 4-quart Dutch oven, combine noodles, broth, carrots, onion, and celery. Bring to boiling; reduce heat. Cover and simmer about 20 minutes or until noodles and vegetables are tender. Stir in 1-1/2 cups of the milk and the peas.
In a small bowl, stir together the remaining 1/2 cup milk, the flour, salt, and 1/8 teaspoon pepper. Whisk until smooth; stir into noodle mixture along with chopped turkey. Cook and stir until thickened and bubbly. Cook and stir for 1 minute more. If desired, season each serving with coarsely ground pepper. Makes 8 servings.