Garlic Rosemary Steak and Potatoes Skillet

Bahan-bahan (4 porsi)

• 2 tablespoons vegetable oil (or light olive oil)
• 2 ribeye steaks (New York strips, or strip loins, 1-inch thick)
• 1 teaspoon steak spice (or more to taste)
• 1 pound baby potatoes (halved)
• 1 ½ teaspoons fresh rosemary (chopped, or ½ teaspoon dried rosemary)
• 2 cloves garlic (minced)
• salt and pepper to taste
• 1 tablespoon salted butter