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Adjust the racks so there's one in the middle of the oven. You may also need to remove the top rack if there's not much space between the middle and top racks. There should be at least 5 inches (13 cm) of space between the racks. Put the buns onto the middle rack in the preheated oven and bake them until the tops turn golden brown. The paste crosses should turn a rich yellow color and harden. Set the sheet of buns on the stove and put 3 tablespoons (60 g) of apricot jam into a small microwave-safe bowl. Heat the jam until it melts. If you don't have apricot jam, substitute peach jam.
Preheat the oven to 425 °F (218 °C) and move the oven racks. Bake the hot cross buns for 20 minutes. Remove the buns and microwave the apricot jam for 10 seconds.