1. To prepare salad, combine first 8 ingredients.
2. To prepare tacos, heat 2 teaspoons oil in a large nonstick skillet over medium-high heat. Sprinkle chicken evenly with chili powder, cumin, and chipotle pepper. Add chicken mixture to pan; sauté 3 minutes. Remove from pan.
3. Heat remaining 1 teaspoon oil in pan. Add bell pepper and 1 cup onion; cook 3 minutes or until crisp-tender. Return chicken mixture to pan; cook 2 minutes or until chicken is done. Sprinkle with 1/4 teaspoon salt.
4. Heat tortillas according to package directions. Arrange 2 tablespoons mixed greens, about 1/3 cup chicken mixture, and about 2 tablespoons salad in each tortilla; fold over.