Preheat your oven to 400°F and trim the Brussels sprouts, cutting them in half lengthwise.
Dice the chicken breast into bite-sized cubes and season evenly with sea salt and black pepper.
In a large oven-safe skillet over medium heat, cook the pancetta until crispy, then remove with a slotted spoon and set aside.
Add the chicken to the same skillet and sear until golden brown on all sides, then remove and set aside with the pancetta.
Add the olive oil to the skillet and place the Brussels sprouts cut-side down, searing for 3 minutes until they develop a dark char.
Transfer the skillet to the oven and roast for 15 minutes until the sprouts are tender and caramelized.
In a small bowl, whisk together the balsamic vinegar, honey, and minced garlic.
Return the skillet to the stovetop over medium heat, adding the chicken and pancetta back into the pan.
Pour the balsamic mixture over the ingredients and toss for 2 minutes until the sauce reduces into a glossy, thick glaze.