Preheat your oven to 425°F.
In a small bowl, whisk together olive oil, lemon juice, minced garlic, salt, and pepper to create a marinade.
Place the chicken breast in a shallow dish and coat evenly with the marinade. Let it sit for at least 10 minutes.
Meanwhile, toss the chopped broccoli with a slight drizzle of olive oil, salt, and pepper on a baking tray.
Place the chicken breast on a separate baking sheet lined with parchment paper. For extra crispiness, you can lightly pat the chicken dry with a paper towel before marinating.
Roast the broccoli in the oven for about 15-20 minutes until tender and slightly charred, stirring once halfway through.
Bake the chicken breast for 20-25 minutes, or until the internal temperature reaches 165°F and the edges are crispy.
While the chicken and broccoli are roasting, prepare the quinoa if not already cooked.
Plate the chicken breast with a side of roasted broccoli and 1/2 cup of cooked quinoa. Drizzle any remaining pan juices over the chicken for extra flavor.
Serve warm and enjoy your balanced, flavorful meal.