Spray nonstick Dutch oven or large saucepan with nonstick cooking spray. Heat over medium heat until hot. Add chicken, onion and garlic; cook 4-6 minutes or until onion is tender, stirring occasionally.
Stir in broth, basil and salt. Bring to a boil. Add rotini; cook over medium-high heat for 8 minutes, stirring occasionally.
Meanwhile, place frozen vegetables in colander or strainer; rinse with warm water until thawed. Drain well. In small bowl, combine 1 cup of the milk and flour; blend well.
Stir vegetables, milk mixture, remaining 3 cups milk and bell pepper into rotini mixture. Bring just to a boil, stirring frequently. Reduce heat to medium; cook 3-5 minutes or until soup thickens and vegetables and pasta are tender, stirring occasionally.
To serve, ladle chowder into 6 individual soup bowls. Sprinkle each with cheese. Makes 6 servings--270 calories--35 calories from fat--4 grams fat.