Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Dice the sweet potato into 1/2-inch cubes and mince the garlic clove.
Pat the chicken thighs completely dry with paper towels to ensure the skin becomes extra crispy.
In a large mixing bowl, combine the chicken thighs, diced sweet potatoes, and minced garlic.
Drizzle with olive oil and sprinkle with sea salt, black pepper, rosemary, and thyme, tossing until everything is evenly coated.
Place the chicken and sweet potatoes on the prepared baking sheet in a single layer, ensuring the chicken is skin-side up.
Roast for 20 minutes in the center of the oven.
Remove the tray, add the asparagus spears to the empty spaces, and squeeze the fresh lemon juice over the entire tray.
Return to the oven and roast for another 10-12 minutes until the chicken skin is golden brown and the internal temperature reaches 165°F.
Let the chicken rest for 5 minutes before serving to keep the meat juicy.