Sprinkle chicken with 1/4 teaspoon salt and 1/4 teaspoon pepper. Heat a Dutch oven coated with cooking spray over medium-high heat. Add chicken; cook 6 minutes or until lightly browned. Remove chicken from pan.
Add onion; sauté 5 minutes or until lightly browned. Return chicken to pan. Stir in broth and paprika; bring to a boil. Cover, reduce heat, and simmer 30 minutes or until chicken is done. Remove from heat.
Place flour in a small bowl. Add sour cream, stirring well with a whisk. Gradually stir sour cream mixture, 1/4 teaspoon salt, and 1/4 teaspoon pepper into chicken mixture. Cook over low heat 5 minutes or until thick, stirring occasionally. Serve over noodles.