Preheat your oven to 400°F and line a baking sheet with parchment paper.
Trim and halve the Brussels sprouts, and finely dice the pancetta.
On the baking sheet, toss the sprouts and pancetta with olive oil, sea salt, and black pepper until evenly coated.
Roast for 20 to 25 minutes, tossing halfway through, until the sprouts are tender and the pancetta is golden and crispy.
While the vegetables roast, season the chicken breast with a pinch of salt and pepper and sear in a hot skillet for 6 minutes per side or until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing it into thin strips.
Combine the roasted sprouts, pancetta, and sliced chicken in a large bowl.
Drizzle the balsamic glaze over the mixture, garnish with fresh thyme leaves, and serve immediately.