Pull some of the honey frames adjacent to the brood frames and replace with new frames. You don't want to split up the brood chamber but enlarge it. With the frames placed next to the brood frames the bees will begin drawing the comb and the queen will begin laying in the cells before they are fully drawn out.
In a honey bound hive it is a good practice to super, taking the honey frames from beside the brood frames, replace them with new frames and then place the honey frames on the outsides of the super. this way the bees will enlarge the brood chamber up as well as out.