HEAT oven to 350ºF.
PLACE fish in single layer on baking sheet sprayed with cooking spray. Mix 1 Tbsp. dressing, garlic and chili powder until blended; spread over fish.
BAKE 20 min. or until fish flakes easily with fork. Meanwhile, combine remaining dressing, radishes, peppers, cilantro and lime juice. Add to coleslaw blend; mix lightly.
FLAKE fish; place on tortillas. Top with coleslaw and avocados.