To prepare the Ultimate Stuffed Potato recipe, you will first need to prepare your potatoes. Cut the potatoes in half lengthwise and scoop out the insides with a potato masher. Place the mashed potatoes, cheese, onion, garlic, thyme, salt, and pepper into the microwave-safe bowl. Microwave on high for 1 to 2 minutes, or until the cheese melts. Remove from microwave and set aside.