Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel and dice the sweet potato into one-inch cubes, then toss them on the baking sheet with avocado oil, half the sea salt, and black pepper.
In a small bowl, mash the ghee with minced garlic, chopped rosemary, and thyme until a smooth paste forms.
Pat the chicken breast dry and spread the garlic-herb ghee mixture evenly over the surface.
Place the chicken on the baking sheet with the sweet potatoes and roast for 15 minutes.
Add the trimmed asparagus to the sheet, squeeze the lemon juice over the vegetables, and sprinkle with the remaining salt.
Roast for another 10 to 12 minutes until the chicken reaches an internal temperature of 165°F.
Let the chicken rest for 5 minutes before slicing to ensure the meat remains juicy and tender.