Step 1: Prepare the Balsamic Marinade

In a medium-sized bowl, whisk together the olive oil, balsamic vinegar, soy sauce (or tamari), honey (or maple syrup), minced garlic, dried Italian herbs, salt, and black pepper. This is your flavor powerhouse marinade that will infuse the chicken with incredible taste and tenderness. Ensure all ingredients are well combined and emulsified for a consistent flavor distribution. Take a moment to smell the aroma of the marinade – the blend of balsamic, garlic, and herbs is already enticing!

Step 2: Marinate the Chicken

Place the chicken breasts or thighs in a resealable plastic bag or a shallow dish. Pour the balsamic marinade over the chicken, ensuring each piece is thoroughly coated. If using a plastic bag, seal it tightly and massage the marinade into the chicken. If using a dish, turn the chicken pieces to coat them evenly. Marinating the chicken is crucial for flavor development and tenderness. Allow the chicken to marinate in the refrigerator for at least 30 minutes, or ideally for 1-2 hours. For even deeper flavor, you can marinate it for up to 4 hours. Longer marinating times result in more flavorful and tender chicken, but avoid marinating for more than 4 hours as the acid in the balsamic vinegar can start to break down the chicken texture if left for too long.

Step 3: Prepare the Brussels Sprouts

While the chicken is marinating, prepare the Brussels sprouts. Preheat your oven to 400°F (200°C). This high temperature is ideal for roasting Brussels sprouts to achieve a crispy exterior and tender interior. Wash and trim the Brussels sprouts. Slice them in half lengthwise, or quarter them if they are large. In a large bowl, toss the Brussels sprouts with 1 tablespoon of olive oil, salt, and pepper. Ensure the Brussels sprouts are evenly coated with oil and seasoning. Tossing them separately ensures they roast properly and don’t become soggy from the chicken marinade.

Step 4: Arrange on a Baking Sheet

Line a large baking sheet with parchment paper for easy cleanup. Spread the Brussels sprouts in a single layer on one side of the baking sheet. Remove the chicken from the marinade, letting any excess marinade drip off. Place the marinated chicken on the other side of the baking sheet, also in a single layer. Avoid overcrowding the baking sheet, as this can steam the chicken and Brussels sprouts instead of roasting them. If necessary, use two baking sheets to ensure everything is arranged in a single layer.

Step 5: Roast to Perfection

Place the baking sheet in the preheated oven and roast for 20-25 minutes, or until the chicken is cooked through and the Brussels sprouts are tender-crisp and slightly browned. The internal temperature of the chicken should reach 165°F (74°C) to ensure it is fully cooked and safe to eat. Use a meat thermometer to check the temperature at the thickest part of the chicken. The Brussels sprouts should be tender when pierced with a fork and have slightly caramelized edges. During roasting, the balsamic marinade will reduce and create a beautiful glaze on the chicken and Brussels sprouts.

Step 6: Baste (Optional, for Extra Glaze)

For an even more pronounced balsamic glaze, you can baste the chicken and Brussels sprouts with the pan juices halfway through cooking. Around the 15-minute mark, carefully remove the baking sheet from the oven. Use a spoon to drizzle the accumulated pan juices over the chicken and Brussels sprouts. Return the baking sheet to the oven and continue roasting for the remaining time. Basting helps to intensify the balsamic flavor and create a richer, more glossy glaze.

Step 7: Rest and Serve

Once the chicken is cooked through and the Brussels sprouts are roasted to your liking, remove the baking sheet from the oven. Let the chicken rest for 5-10 minutes before serving. Resting allows the juices to redistribute throughout the chicken, resulting in a more tender and flavorful final product. Serve the Balsamic Chicken and Brussels Sprouts immediately while they are still warm and delicious. Garnish with fresh herbs like parsley or thyme, if desired, for a final touch of freshness and visual appeal.