Drain marinade from artichokes into 2-quart saucepan. Crush garlic and add to marinade. Add onion and cook, covered, 10 minutes over low heat. Blend flour. Slowly stir in 1 can broth; heat to boiling, stirring. Boil 1 minute or until mixture thickens. Add hot mixture to artichokes and blend in blender until smooth. STRAIN into saucepan. Add remaining broth and half and half. Heat to serving temperature; do not boil. Sprinkle each serving with parsley. Makes 4 servings (4 1/3 cups).