Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Rub the chicken breast with olive oil, dried thyme, and half of the sea salt and black pepper.
Roast the chicken for 20-25 minutes or until the internal temperature reaches 165°F, then let it rest for 5 minutes before slicing.
While the chicken roasts, peel and cube the russet potato into 1-inch pieces.
Place the potato cubes in a pot of cold water, bring to a boil, and cook for 12-15 minutes until fork-tender.
Mince the garlic cloves and finely chop the fresh chives while the potatoes are boiling.
Drain the potatoes and return them to the warm pot; add the ghee, minced garlic, Greek yogurt, and the remaining salt and pepper.
Mash the potatoes until smooth and creamy, then stir in the fresh chives.
Serve the sliced herb chicken over a generous portion of the garlic mashed potatoes.