Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Spread the broccoli florets on the baking sheet and drizzle with half of the olive oil, half the sea salt, and half the black pepper.
Season the chicken breast with the remaining salt and pepper, then place it on the baking sheet next to the broccoli.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the broccoli is tender and slightly charred.
While the chicken and broccoli roast, rinse the quinoa under cold water using a fine-mesh sieve.
Combine the rinsed quinoa and water in a small saucepan, bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes until the water is absorbed.
In a small bowl, whisk together the remaining olive oil, lemon juice, and minced garlic to create a bright dressing.
Once cooked, slice the chicken into strips and fluff the quinoa with a fork.
Assemble the bowl by placing the fluffy quinoa at the base, topping with roasted broccoli and sliced chicken, and drizzling the lemon-garlic dressing over the top.