Preheat your oven to 400°F (200°C).
Trim the Brussels sprouts and slice them in half lengthwise.
Season the chicken breast on both sides with sea salt and black pepper.
In an oven-safe skillet over medium heat, sauté the diced pancetta until it becomes crispy and the fat renders.
Remove the pancetta with a slotted spoon and set aside, leaving the rendered fat in the skillet.
Add the olive oil to the skillet and sear the chicken breast for 3 minutes per side until a golden crust forms.
Remove the chicken temporarily and add the Brussels sprouts and minced garlic to the skillet, tossing to coat in the remaining fat.
Place the chicken back on top of the sprouts and transfer the entire skillet to the oven.
Roast for 12-15 minutes until the chicken is cooked through and the sprouts are tender and charred.
Slice the chicken into strips, stir in the crispy pancetta, and drizzle the balsamic glaze over the dish before serving.