01 - Set oven to 425°F and allow to fully preheat.
02 - In a large bowl, combine shrimp, sliced bell peppers, sliced onion, olive oil, fajita seasoning, salt, and pepper. Toss to coat ingredients evenly.
03 - Spread the seasoned shrimp and vegetables in a single layer across a baking sheet.
04 - Roast in the oven for 10 to 12 minutes or until shrimp turn pink and vegetables are tender.
05 - Serve immediately with warm tortillas.