Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the broccoli florets with half of the olive oil, sea salt, and black pepper, then spread them in a single layer on the baking sheet.
Roast the broccoli for 15-20 minutes until the edges are slightly charred and tender.
While the broccoli roasts, rinse the quinoa under cold water and place it in a small saucepan with 2/3 cup of water.
Bring the quinoa to a boil, then reduce heat to low, cover, and simmer for 12-15 minutes until the water is absorbed and the quinoa is fluffy.
Season the chicken breast with the remaining olive oil, garlic powder, and dried oregano.
Heat a grill pan or outdoor grill over medium-high heat and cook the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before slicing it into strips.
Assemble the bowl by placing the fluffy quinoa at the base, topped with the grilled chicken and charred broccoli.