Ground Turkey Fajita Bowls

Name: Ground Turkey Fajita Bowls
Ingredients: 1½ tablespoons extra-virgin olive oil , divided; 1 large white onion , sliced (about 3 cups ); 2 medium red bell peppers , sliced (about 2¼ cups ); 1 cup corn kernels , fresh or thawed; 1½ teaspoons chili powder , divided; 1 ½ teaspoons dried oregano , divided; ¾ teaspoon salt , divided; 1 pound lean ground turkey; 1 cup pico de gallo; ½ cup water; 1½ teaspoons garlic powder; 1 teaspoon ground cumin; ½ cup reduced-fat sour cream; 2 tablespoons chopped fresh cilantro , plus more for garnish; 1 tablespoon lime juice; 2 cups hot cooked brown rice; 1 large avocado , quartered; 1 small jalapeño pepper, thinly sliced ( 4 tablespoons )