Step 2: In a small bowl, combine 2 tablespoons of olive oil, Italian seasoning, ½ teaspoon of salt, black pepper, lemon juice, Dijon mustard, and stone ground mustard. Whisk together until fully blended.
Step 3: Place the chicken thighs in a large bowl or resealable plastic bag. Pour the marinade over the chicken, ensuring each piece is well-coated. Allow it to marinate for at least 30 minutes.
Step 4: Prepare your vegetables by trimming the Brussels sprouts and cutting them in half if large. Slice the red onion into wedges and peel the garlic cloves.
Step 5: Drizzle the remaining 1 tablespoon of olive oil across the bottom of a large sheet pan. Place the marinated chicken thighs on one side and arrange the Brussels sprouts, red onions, and garlic on the other side. Season the vegetables with the remaining ½ teaspoon of salt.
Step 6: Roast in the preheated oven for about 35-40 minutes, or until the chicken reaches an internal temperature of 165°F (74°C).
Step 7: Once cooked, remove from the oven and allow the chicken to rest for a few minutes before serving.
Notes
Pat the chicken thighs dry before marinating for crispier skin. You can substitute boneless thighs and adjust cooking time accordingly.