01 - Preheat your oven to 425°F (220°C). Line a large sheet pan with parchment paper for easy cleanup.
02 - In a small bowl, thoroughly whisk together the balsamic vinegar, olive oil, honey (or maple syrup), minced garlic, thyme, salt, and black pepper.
03 - Arrange the chicken breasts on the prepared sheet pan. Scatter the halved Brussels sprouts, cherries, and sliced red onion around the chicken.
04 - Drizzle the prepared balsamic mixture evenly over the chicken and vegetables. Gently toss the Brussels sprouts to ensure they are well coated with the glaze.
05 - Roast for 25 to 30 minutes. The chicken should be cooked through, reaching an internal temperature of 165°F (74°C), and the Brussels sprouts should be tender and nicely caramelized.
06 - Remove the sheet pan from the oven and allow the chicken to rest for 5 minutes. Slice the chicken if desired, and sprinkle with fresh herbs before serving.