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 is roasting, peel and cube the russet potato and place it in a pot of cold salted water.
Bring the water to a boil and cook the potatoes for 12-15 minutes until they are completely fork-tender.
Drain the potatoes and return them to the warm pot for 30 seconds to steam off any excess moisture.
Mince the garlic cloves and finely chop the fresh chives.
Mash the potatoes with the ghee, Greek yogurt, minced garlic, and the remaining salt and pepper until smooth and creamy.
Fold the fresh chives into the mashed potatoes and serve immediately alongside the sliced herb chicken.