Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Place the chicken breast, broccoli florets, and sliced red bell pepper onto the prepared baking sheet.
Drizzle the ingredients with extra virgin olive oil and season evenly with sea salt, black pepper, and garlic powder, tossing to ensure a thorough coat.
Roast in the oven for 18-22 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
While the chicken and vegetables roast, whisk together the tahini and lemon juice in a small bowl, adding a splash of warm water if needed to reach a smooth, drizzling consistency.
Once cooked, remove the chicken from the oven and slice it into bite-sized strips.
Assemble your bowl by placing the fluffy cooked quinoa at the base, topping it with the roasted chicken and vegetables, and finishing with the creamy lemon-tahini drizzle.