Slice the chicken breast into bite-sized pieces and season evenly with the sea salt, black pepper, and garlic powder.
Trim the woody ends of the Brussels sprouts and slice each one in half lengthwise.
Heat the extra virgin olive oil in a large non-stick skillet over medium-high heat.
Add the diced pancetta to the skillet and cook for 2-3 minutes until it begins to crisp and the fat has rendered.
Add the seasoned chicken pieces to the skillet and sear for 4-5 minutes, turning occasionally, until golden brown and cooked through.
Remove the chicken and pancetta from the skillet and set aside on a plate, leaving the flavorful rendered fat in the pan.
Place the Brussels sprouts cut-side down in the skillet and sear undisturbed for 3-4 minutes until the bottoms are deeply caramelized.
Toss the sprouts and cook for an additional 2 minutes until tender-crisp.
Return the chicken and pancetta to the pan, drizzle with the balsamic glaze, and toss everything together for 1 minute until the glaze is hot and bubbly.