In slow cooker, stir together salsa, chicken, broth and chili powder. Cook 3 1/2 hours on high or 7 1/2 hours on low.
Transfer chicken to cutting board and coarsely shred; return to slow cooker. Stir in beans, rice and corn. Cook 30 minutes on high, or until rice is cooked through.
Serve garnished with avocado, cilantro, onion, tomatoes, limes, sour cream and cheese.