Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Ensure the chicken breast is fully thawed and pat it dry with paper towels to ensure a better sear and texture.
Peel and cube the sweet potato into half-inch pieces then toss with half of the olive oil and a pinch of salt and pepper.
Spread the sweet potatoes on the baking sheet and roast for 10 minutes to give them a head start.
While potatoes roast, chop the broccoli into florets and slice the bell pepper into thin strips.
Add the chicken, broccoli, and peppers to the sheet pan, drizzling everything with the remaining oil, lemon juice, and all the spices.
Toss the vegetables to coat and ensure the chicken is nestled in a single layer for even cooking.
Bake for an additional 15 to 20 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Allow the chicken to rest for 5 minutes before slicing to ensure every bite remains juicy and flavorful.