Peel the potato and cut into 1-inch cubes, then place in a pot of salted water and boil for 12-15 minutes until fork-tender.
While potatoes boil, mince the garlic and finely chop the fresh chives.
Season the chicken breast evenly with the dried oregano, half of the sea salt, and half of the 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 saucepan, melt the ghee over low heat and sauté the minced garlic for 1-2 minutes until fragrant but not browned.
Drain the cooked potatoes and return them to the pot, mashing them thoroughly while they are still hot.
Fold in the Greek yogurt, the garlic-infused ghee, and the remaining salt and pepper until the texture is smooth and creamy.
Slice the chicken breast and serve it over the mashed potatoes, garnishing the entire dish with fresh chives.