Pat the chicken thigh fillets completely dry with a paper towel to ensure a proper sear, then season both sides evenly with sea salt and black pepper.
Heat the avocado oil in a large cast-iron or stainless steel skillet over medium-high heat until the oil is shimmering but not smoking.
Place the chicken thighs in the skillet, smooth side down, and sear undisturbed for 5 to 6 minutes until a deep golden-brown crust forms.
Flip the chicken and add the smashed garlic cloves, chopped rosemary, and thyme to the pan, allowing the herbs to infuse into the oil.
Cook for another 5 minutes, or until the internal temperature reaches 165°F, then remove the chicken to a plate to rest for 3 minutes.
In the same skillet, toss in the asparagus spears and cherry tomatoes, sautéing for 4 minutes until the asparagus is bright green and the tomatoes begin to blister.
Drizzle the lemon juice over the vegetables and chicken, then serve immediately while the chicken is juicy and the skin is crisp.