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