Cut potatoes in half and using a melon ball scoop, scoop out a round hole approximately 3/4-inch. Carefully cook the potatoes in gently boiling water. When cooked (approximately 12 minutes), cool in cold water. Drain and set aside. Mix cheddar cheese, mayonnaise, and garlic together. Season accordingly. Fill the potatoes with cheddar cheese mixture. Bake in 375 degree oven until cheese melts, approximately 10 to 12 minutes.