HEAT oil in large saucepan over medium heat. Add onion; cook, stirring occasionally, for 3 to 4 minutes or until soft. Add vegetables, pumpkin, broth, water and thyme. Bring to a boil, stirring occasionally. Stir in rice, salt, black pepper and cayenne pepper; bring to a boil. Cover; reduce heat to low. Cook for 5 minutes. Remove from heat; let stand for 10 minutes or until liquid is absorbed. Fluff with fork before serving.