Preheat oven to 450 degrees.
In a large bowl, combine onion, bell pepper, shrimp, olive oil, salt and pepper and spices.
Toss to combine.
Spray baking sheet with non stick cooking spray.
Spread shrimp, bell peppers and onions on baking sheet.
Cook at 450 degrees for about 8 minutes. Then turn oven to broil and cook for additional 2 minutes or until shrimp is cooked through.
Squeeze juice from fresh lime over fajita mixture and top with fresh cilantro.
Serve in warm tortillas.