Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the broccoli florets with half of the olive oil and a pinch of sea salt, then spread them in a single layer on the baking sheet.
Roast the broccoli for 15-20 minutes until the edges are tender and slightly charred.
While the broccoli roasts, season the chicken breast with lemon juice, garlic powder, salt, and black pepper.
Heat a grill pan or outdoor grill over medium-high heat and lightly coat with a touch of oil if needed.
Grill the chicken for 6-7 minutes per side or until the internal temperature reaches 165°F.
Allow the chicken to rest for 5 minutes before slicing it into strips.
Fluff the pre-cooked quinoa and warm it through in a small saucepan or microwave.
Assemble the bowl by placing the quinoa at the base, topped with the grilled chicken and roasted broccoli.
Drizzle the remaining olive oil over the dish and finish with an extra squeeze of fresh lemon if desired.