Preheat your oven to 425°F (220°C).
Trim the ends of the Brussels sprouts and slice them in half. Toss them with olive oil, salt, and pepper on a baking sheet.
Roast the Brussels sprouts in the preheated oven for 20-25 minutes, until they are crispy on the edges and tender inside, stirring halfway through for even cooking.
While the sprouts are roasting, season the chicken breast with salt and pepper. Grill or pan-sear the chicken over medium-high heat for about 6-7 minutes per side or until fully cooked. Once cooked, slice the chicken into strips.
In a small saucepan, combine the honey and balsamic vinegar. Heat over medium-low heat, stirring occasionally until the mixture begins to thicken slightly, about 3-4 minutes.
Once the Brussels sprouts are done, drizzle the honey-balsamic glaze over them and toss to coat evenly.
Plate the glazed Brussels sprouts and top with sliced grilled chicken. Serve warm and enjoy the tangy-sweet flavor combined with the savory grilled chicken.