Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the sweet potato into half-inch cubes and chop the broccoli, bell pepper, and zucchini into bite-sized pieces.
Place the vegetables on the baking sheet, drizzle with half of the olive oil, and sprinkle with a pinch of sea salt and black pepper.
Toss the vegetables to coat evenly and roast in the oven for 20-25 minutes until the sweet potatoes are tender and edges are slightly browned.
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 heavy-bottomed skillet over medium-high heat.
Place the chicken in the hot skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
Remove the chicken from the pan and let it rest for 5 minutes to lock in the juices before slicing.
Plate the sliced chicken alongside the roasted vegetable medley and serve immediately.