Preheat your oven to 400°F (200°C).
Peel and cube the sweet potato into 1/2-inch pieces and slice the red bell pepper into strips.
On a large sheet pan, toss the sweet potato, broccoli florets, and bell pepper with half of the olive oil, half of the sea salt, and half of the black pepper.
Roast the vegetables in the oven for 20-25 minutes, tossing halfway through, until the sweet potatoes are tender and the broccoli edges are slightly charred.
While the vegetables roast, season the chicken breast on both sides with garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining olive oil in a stainless steel or cast-iron skillet over medium-high heat.
Once the pan is hot, add the chicken breast and sear for 6-7 minutes per side, or until the exterior is golden brown and the internal temperature reaches 165°F.
Remove the chicken from the pan and let it rest for 3-5 minutes before slicing.
Plate the juicy chicken alongside the roasted vegetable medley and serve immediately.