Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Season the chicken breast with half of the sea salt, black pepper, rosemary, and thyme, then roast for 20-25 minutes until the internal temperature reaches 165°F.
While the chicken roasts, peel and dice the Yukon Gold potato into 1-inch cubes.
Place the potato cubes in a pot of cold salted water, bring to a boil, and cook for 12-15 minutes until fork-tender.
Steam the broccoli florets in a steamer basket over boiling water for about 5 minutes until they are bright green and tender-crisp.
Mince the garlic cloves and gently sauté them in the ghee in a small pan over low heat for 1-2 minutes until fragrant but not browned.
Drain the potatoes and return them to the pot. Add the sautéed garlic and ghee, Greek yogurt, and the remaining herbs, salt, and pepper.
Mash the potato mixture until smooth and creamy.
Slice the roasted chicken breast and serve it immediately over the bed of garlic mashed potatoes with the steamed broccoli on the side.