Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Prepare the vegetables by cubing the sweet potato into half-inch pieces and halving the Brussels sprouts.
Toss the sweet potatoes and Brussels sprouts on the baking sheet with 0.5 tablespoon of olive oil, half of the sea salt, and half of the black pepper.
Roast the vegetables for 20 to 25 minutes, tossing halfway through, until they are tender and caramelized.
While vegetables roast, season the chicken breast on both sides with the remaining salt, pepper, and the dried oregano.
Heat the remaining 0.5 tablespoon of olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and sear for 5 to 7 minutes per side, or until the internal temperature reaches 165°F.
In a small bowl, whisk together the balsamic vinegar, maple syrup, and minced garlic.
During the last 2 minutes of cooking the chicken, pour the balsamic mixture into the skillet and let it simmer until it thickens into a glossy glaze, spooning it over the chicken.
Plate the glazed chicken alongside the roasted vegetables and serve immediately.