01 -
Set oven temperature to 425°F (220°C) to prepare for roasting.
02 -
In a large mixing bowl, toss chicken thighs, sliced bell peppers, and sliced red onion with olive oil and Cajun seasoning until evenly coated.
03 -
Spread the coated chicken and vegetables in a single layer on a baking sheet.
04 -
Transfer the baking sheet to the oven and roast for 25 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and vegetables are tender.