Best with thick, slightly stale white bread so the custard absorbs without turning mushy. If using fresh bread, lightly toast it first to dry it out. Keep cooked sticks warm on a rack in a low oven while finishing the batch. Leftovers freeze well: cool, freeze on a tray, then store in a bag for up to 2 months. Reheat from frozen in a 375°F oven or air fryer until hot and crisp.