Drain artichoke hearts and give them a coarse chop.Place hearts in a microwave safe dish and add mayo, cheese, and garlic powder. Stir till combined. Microwave for 30 seconds, remove, stir, replace in microwave for another 30 seconds. Repeat till mixture is combined and cheesy (approximately 2 min. 30 sec).Cut out top of bread to make a bowl. Coarsely chop the top of the bread.Pour the artichoke dip into the bowl and serve with bread on side.