Savoury stuffed pancakes

I bought similar stuffed pancakes for breakfast in Hong Kong and China hawker stall. They are simple to make great for breakfast or brunch. I think this is popular in Northern China rather than a Cantonese recipe. You can use any filling you like meat and veg, potato and vegetables (vegetarian) or even cheese and onion english style, great to use up any leftovers. You can make them ahead and warm