Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the broccoli florets with half of the olive oil, minced garlic, salt, and pepper.
Spread the broccoli on the baking sheet and roast for 15-20 minutes until the edges are crisp and slightly charred.
While the broccoli roasts, season the chicken breast with lemon juice, salt, pepper, and any desired dried herbs.
Heat a grill pan or outdoor grill over medium-high heat and lightly coat with the remaining olive oil.
Grill the chicken for 6-7 minutes per side, or until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing it into strips.
Place the cooked quinoa in a bowl, top with the sliced grilled chicken and roasted broccoli, and serve immediately.