Preheat your oven to 425°F.
In a small bowl, combine lemon juice, minced garlic, salt, and black pepper.
Place the chicken breast between two sheets of plastic wrap and gently pound to an even thickness of about ½ inch.
Coat the chicken breast with the lemon garlic marinade and let it sit for about 10 minutes.
While marinating, trim the woody ends off the asparagus and place them on a baking sheet.
Drizzle olive oil over the asparagus and season lightly with salt and pepper.
Place both the chicken (in an oven-safe dish) and the asparagus in the oven.
Roast the asparagus for 12-15 minutes until tender and slightly crisp on the edges, and bake the chicken for 20-25 minutes until cooked through (internal temperature reaches 165°F).
For extra crispiness on the chicken, place it under the broiler for the last 2-3 minutes, watching closely to avoid burning.
Remove from the oven, let the chicken rest for a few minutes, then serve alongside the roasted asparagus.