Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Season the chicken breast evenly with the sea salt, black pepper, and garlic powder.
Place the chicken breast, broccoli florets, and chopped red bell pepper on the sheet pan.
Drizzle half of the olive oil over the vegetables and toss to coat.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
While the chicken roasts, place the raw kale in a large mixing bowl with the remaining olive oil and lemon juice.
Massage the kale with your hands for 2 minutes until it becomes dark green and soft.
Whisk the Dijon mustard into the kale mixture until well combined.
Once cooked, slice the chicken into bite-sized strips.
Assemble the bowl by layering the cooked quinoa, massaged kale, roasted vegetables, and sliced chicken.