Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Pat the chicken breast completely dry with paper towels and season both sides with sea salt and black pepper.
In a small shallow bowl, whisk together the almond flour, garlic powder, dried thyme, and lemon zest to create the crust mixture.
Press the top side of the chicken breast firmly into the almond flour mixture until a thick, even coating is formed.
Heat the olive oil in a large oven-safe skillet over medium-high heat and sear the chicken, crust-side down, for 3-4 minutes until golden and crispy.
Flip the chicken breast over and arrange the trimmed asparagus spears around the chicken in the skillet.
Drizzle the lemon juice over the asparagus and season the vegetables with a pinch of sea salt.
Transfer the skillet to the oven and roast for 10-12 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the meat juicy.