This Christmas traybake is very quick and easy – much faster than making mince pies. The cooked streusel ... at room temperature or overnight. To reheat: warm in a preheated oven 150C/300F ...

Mince pies, once baked, will keep for a few days in an air-tight tin but the bottoms may become soggy. You can make the pastry ahead and freeze it for up to a month so it's ready to roll when you are.