Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the broccoli florets with one teaspoon of olive oil, salt, pepper, and a pinch of garlic powder.
Spread the broccoli on the baking sheet and roast for 15 to 20 minutes until the edges are charred and tender.
Season the chicken breast with salt, pepper, and dried oregano.
Heat a grill pan or outdoor grill over medium-high heat and lightly coat with cooking spray.
Grill the chicken for 6 to 7 minutes per side or until the internal temperature reaches 165°F.
While the chicken rests, warm the pre-cooked quinoa in a small pan or microwave.
Whisk the remaining teaspoon of olive oil with the lemon juice to create a light dressing.
Slice the chicken and serve it over the quinoa with the roasted broccoli on the side, drizzling everything with the lemon dressing.