Preheat the oven to 400°F (200°C).
In a small bowl, mix lemon juice, olive oil, minced garlic, and mixed fresh herbs.
Pat the chicken breast dry and then brush half of the lemon herb mixture over both sides of the chicken.
Place the chicken on a lightly oiled baking sheet and bake for 18-20 minutes, or until the internal temperature reaches 165°F (74°C).
Meanwhile, toss the asparagus spears with any remaining herb mixture, a pinch of salt, and pepper. Lay them on a separate baking tray.
Roast the asparagus in the oven for about 10-12 minutes until tender and slightly crispy.
Prepare the cooked quinoa as per package instructions if not pre-cooked.
Plate the cooked quinoa, top with sliced crispy lemon herb chicken, and arrange the roasted asparagus on the side.
Drizzle any extra pan juices over the chicken and serve immediately.