Preheat the oven to 200C/fan oven 180C/400F/Gas 6. When risen, press down an egg-sized indentation into each bun and fill with the custard. Brush the bun with beaten egg. Bake for 20 minutes ...

Costco's new Panda Bao Buns are the latest viral must-have. These cute custard-filled treats are selling out fast—here’s where you might find them.