Peel the potato and cut it into 1-inch cubes.
Place the potato cubes and garlic cloves in a pot of cold water with a pinch of salt.
Bring the water to a boil and simmer for 12 to 15 minutes until the potatoes are fork-tender.
While the potatoes cook, season the chicken breast with half of the sea salt and black pepper.
Heat the olive oil in a skillet over medium heat and sear the chicken for 6 to 8 minutes per side until the internal temperature reaches 165 degrees.
Drain the potatoes and garlic, then return them to the warm pot for one minute to allow excess moisture to evaporate.
Add the ghee, Greek yogurt, and the remaining salt and pepper to the pot.
Mash the mixture until smooth and creamy, then fold in the freshly chopped chives.
Slice the chicken and serve it immediately over the warm, buttery mashed potatoes.