Begin by placing the chicken breast between two sheets of plastic wrap and gently pounding it to an even thickness for uniform cooking.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, salt, and black pepper to create the marinade.
Coat the chicken thoroughly with the marinade and let it rest for at least 15 minutes at room temperature.
While the chicken marinates, preheat your oven to 425°F. Arrange the asparagus on a baking sheet, drizzle with a little olive oil if desired (optional from pantry), and season lightly with salt and pepper.
Roast the asparagus in the oven for about 10-12 minutes, until they are tender and slightly crispy.
Heat a non-stick skillet over medium-high heat. Once hot, add the marinated chicken breast. Sear for about 5-6 minutes on each side, or until the internal temperature reaches 165°F.
Once cooked, transfer the chicken to a plate and let it rest for a few minutes.
Serve the pan-seared chicken alongside the roasted asparagus, drizzling any remaining pan juices over the chicken for added flavor.