Preheat the oven to 425°F.
Pat the chicken breast dry and season both sides with salt, pepper, garlic powder, and mixed fresh herbs.
Heat a non-stick skillet over medium-high heat, drizzle in olive oil and sear the chicken for about 2 minutes per side until crispy.
Transfer the chicken to a baking sheet and squeeze half a lemon over it. Place in the oven and bake for 10-12 minutes, or until cooked through.
Meanwhile, trim the tough ends of the asparagus and toss with a pinch of salt, pepper, and a tiny drizzle of olive oil.
Spread the asparagus on a baking tray and roast in the oven alongside the chicken for about 10 minutes until tender and slightly crispy.
Warm the cooked quinoa if needed, or reheat it on the stovetop with a splash of water, stirring until heated through.
Plate the quinoa as a base, top with sliced crispy lemon herb chicken, and arrange the roasted asparagus on the side. Finish with an extra squeeze of lemon if desired.