Step 1: Prepare the Balsamic Glaze
In a small bowl, whisk together balsamic vinegar, honey, Dijon mustard, olive oil, garlic, oregano, salt, black pepper, and red pepper flakes.
Pour half of this mixture into a zip-top bag or shallow dish and add the chicken breasts. Let it marinate for at least 30 minutes (or up to 8 hours in the fridge) for maximum flavor. Reserve the remaining balsamic glaze for cooking.
Step 2: Roast the Brussels Sprouts
Preheat your oven to 425°F (220°C).
Line a baking sheet with parchment paper. Toss the Brussels sprouts with olive oil, salt, black pepper, garlic powder, and smoked paprika until well coated.
Spread them out evenly on the baking sheet and roast for 20–25 minutes, flipping halfway through.
If using Parmesan, sprinkle it on during the last 5 minutes of roasting.
Step 3: Cook the Chicken
Heat a large skillet over medium-high heat and add a drizzle of olive oil.
Remove the chicken from the marinade (discard used marinade) and place it in the skillet. Sear each side for 4–5 minutes until golden brown.
Reduce heat to medium-low, then pour the reserved balsamic glaze over the chicken. Let it simmer for 3–5 minutes, flipping occasionally, until the glaze thickens and the chicken is cooked through (internal temperature of 165°F (75°C)).
Step 4: Serve and Enjoy!
Arrange the roasted Brussels sprouts on a serving plate and top with the balsamic glazed chicken.
Drizzle with extra balsamic reduction and garnish with chopped parsley.
Serve warm and enjoy the burst of flavors in every bite!