Vegetarian Jambalaya

Name: Vegetarian Jambalaya
Ingredients: 1 medium onion, finely chopped; 1 cup chopped celery; 1 cup chopped green pepper; 1 cup sliced fresh mushrooms; 2 garlic cloves, minced; 1 teaspoon olive oil; 3 cups chopped fresh tomatoes; 2 cups water; 1 cup uncooked long grain rice; 2 tablespoons reduced-sodium soy sauce; 1 tablespoon minced fresh parsley; 1/4 teaspoon salt; 1/4 teaspoon paprika; 1/8 teaspoon cayenne pepper; 1/8 teaspoon chili powder; 1/8 teaspoon pepper; 6 tablespoons reduced fat sour cream