with Chipotle Sour Cream
In small bowl, combine oil, lime juice (reserving 1 tablespoon), 2 tablespoons cilantro, 1 teaspoon cumin and chili powder. Place tilapia in a shallow dish; pour marinade over fish. Let stand 30 minutes.
Remove fish from marinade; discard marinade. Place fish on broiler pan that has been sprayed with no-stick cooking spray. Broil 4 inches from heat until fish flakes easily with a fork (about 10 minutes per inch of thickness).
Meanwhile, in small bowl, combine sour cream, reserved lime juice, remaining cilantro, remaining cumin, chipotle peppers and lime zest; salt and pepper to taste.
Break up fish and divide among tortillas. Top with lettuce, tomatoes, avocados, cheese and chipotle sour cream.