Preheat your oven to 400°F (200°C).
Dice the red potatoes into 1/2-inch cubes and toss them with 0.5 tbsp of olive oil and a pinch of sea salt on a baking sheet.
Roast the potatoes for 20-25 minutes, flipping halfway through, until they are golden brown and crispy.
While potatoes roast, season the chicken breast with the remaining sea salt and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a large skillet over medium-high heat. Sear the chicken for 6-7 minutes per side until fully cooked and golden.
Remove the chicken from the skillet and set aside to rest.
In the same skillet, reduce heat to medium and add the ghee and minced garlic, sautéing for 30 seconds until fragrant.
Stir in the lemon juice, lemon zest, and chopped fresh rosemary, scraping the bottom of the pan to release the flavorful browned bits.
Add the roasted potatoes and chicken back into the skillet, tossing briefly in the lemon-herb sauce before serving.