Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Dice the sweet potato into half-inch cubes, chop the broccoli into florets, and slice the red bell pepper into bite-sized pieces.
Place the vegetables on the baking sheet and toss with half of the olive oil, half of the sea salt, and half of the black pepper.
Roast the vegetables 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 evenly on both sides with the garlic powder, smoked paprika, dried oregano, and the remaining salt and pepper.
Heat the remaining olive oil in a heavy-bottomed skillet over medium-high heat.
Place the chicken in the hot skillet and sear for 6-7 minutes per side 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 minutes before slicing.
Serve the sliced chicken alongside the roasted vegetable medley while hot.