1. Preheat broiler.
2. Cut bell peppers in half; discard seeds and membranes. Place bell peppers, skin sides up, on a baking sheet; flatten. Broil 10 minutes or until blackened. Add ancho; broil 2 minutes. Place bell peppers in a paper bag; close tightly. Let stand 5 minutes; peel. Place bell peppers, ancho, 1/4 teaspoon salt, and next 8 ingredients (through bread) in a food processor; process until smooth.
3. Heat a large skillet over medium-high heat. Sprinkle 1/4 teaspoon salt over fish. Coat pan with cooking spray. Add fish to pan; cook 6 minutes on each side or until desired degree of doneness. Top with sauce; serve with lemon wedges.