Heat oven to 350°F. 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.