Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Toss the broccoli florets with one teaspoon of olive oil, salt, and pepper, 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 the remaining teaspoon of olive oil, lemon juice, garlic powder, salt, and pepper.
Heat a grill or grill pan over medium-high heat and cook the chicken for 6-7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 5 minutes to keep it juicy before slicing it into strips.
Warm the pre-cooked quinoa if needed and fluff it with a fork.
Assemble your lunch bowl by placing the quinoa at the base, topped with the roasted broccoli and sliced grilled chicken.