Peel the russet potato and cut into 1-inch cubes. Place 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 potatoes boil, season the chicken breast on both sides with half of the sea salt and black pepper.
Heat olive oil in a skillet over medium-high heat. Add the chicken breast and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F. Remove from heat and let rest.
Steam the broccoli florets for 4-5 minutes until they are bright green and tender-crisp.
Drain the cooked potatoes and return them to the pot. Add the minced garlic cloves, ghee, Greek yogurt, and the remaining salt and pepper. Mash until smooth and creamy.
Slice the rested chicken breast into strips.
Bowl assembly: Scoop the garlic mashed potatoes into a bowl, top with the sliced chicken and steamed broccoli, and garnish with freshly chopped chives.