Peel the Russet potato and cut it into uniform one-inch cubes.
Place the potato cubes in a pot of cold water with a pinch of salt, bring to a boil, and cook for 12-15 minutes until fork-tender.
While the potatoes boil, season the chicken breast with half of the sea salt and black pepper.
Heat the olive oil in a skillet over medium-high heat and sear the chicken for 6-7 minutes per side until the internal temperature reaches 165 degrees Fahrenheit.
In a small pan, melt the ghee over low heat and add the minced garlic, sautéing for 1-2 minutes until fragrant but not browned.
Drain the potatoes thoroughly and return them to the warm pot to allow excess moisture to evaporate.
Add the garlic-infused ghee, Greek yogurt, and the remaining salt and pepper to the potatoes.
Mash the potatoes until smooth and velvety, then plate them alongside the sliced chicken breast.
Garnish with finely chopped fresh chives before serving hot.