Preheat your oven to 400°F and line a large sheet pan with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces and dice the sweet potato, broccoli, and bell peppers into uniform sizes.
Mince the garlic cloves finely.
In a large mixing bowl, combine the chicken and vegetables with olive oil, minced garlic, rosemary, thyme, salt, and pepper.
Toss the mixture thoroughly until every piece is evenly coated with oil and seasonings.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast in the oven for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are tender and slightly caramelized.