Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Toss the broccoli florets with half of the olive oil and a generous pinch of black pepper on the prepared baking sheet.
Roast the broccoli for 15-20 minutes until the edges are tender and slightly charred.
While the broccoli is roasting, combine the dry quinoa and 1/2 cup of water in a small saucepan and bring to a boil.
Reduce the heat to low, cover, and simmer the quinoa for 12-15 minutes until the water is absorbed and the quinoa is fluffy.
Season the chicken breast with garlic powder and black pepper.
Grill the chicken over medium-high heat for approximately 6-7 minutes per side until the internal temperature reaches 165°F.
In a small bowl, whisk together the remaining olive oil and lemon juice.
Fluff the cooked quinoa with a fork, then stir in the lemon-oil mixture and the hemp seeds.
Slice the grilled chicken and serve it over the quinoa bed with the roasted broccoli on the side.