Preheat your oven to 400°F (200°C) and prepare a baking sheet with parchment paper.
Toss the broccoli florets with one teaspoon of olive oil, minced garlic, salt, and pepper, then spread them on the baking sheet.
Roast the broccoli for 15-20 minutes until the edges are slightly charred and tender.
While broccoli roasts, season the chicken breast with salt, pepper, and any desired dried herbs.
Heat a grill pan or outdoor grill over medium-high heat and lightly coat with the remaining teaspoon of olive oil.
Grill the chicken for 6-7 minutes per side or until the internal temperature reaches 165°F (74°C).
Warm the pre-cooked quinoa in a small saucepan or microwave until fluffy.
Slice the grilled chicken and serve it alongside the roasted broccoli and quinoa, finishing with a fresh squeeze of lemon juice.