Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
In a small bowl, whisk together the harissa paste, extra virgin olive oil, honey, lemon juice, minced garlic, sea salt, and black pepper until smooth.
Place the chicken breast, broccoli florets, sliced red bell pepper, diced red onion, and chickpeas onto the prepared baking sheet.
Pour the harissa dressing over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is evenly coated.
Arrange the ingredients in a single layer, ensuring the chicken is in the center and not overcrowded by the vegetables.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with slightly charred edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving with the roasted vegetable medley.