In a large bowl, add the butter, sugar, and salt and mix until combined. Mix in the egg, scraping down the bowl to ensure it is fully incorporated.
Add the flour slowly but don't over-mix. Divide the dough into 2 balls and flatten slightly and wrap in cling film. Pop them into either the freezer for 30 minutes or the refrigerator for 2 hours (or even overnight if you have time).
Remove the dough from the freezer or fridge and roll out to about 1cm/1/8 inch thick onto a lightly floured surface. Cut out circles with your cutter that are larger than your tins/moulds and gently place them in your moulds. Don't stretch the dough, as your pastry will shrink from the sides when baked. Prick the base a few times with a fork (but not right through).
Cut off any excess pastry with a knife. Place the tins on a baking tray and chill in the freezer for 15 to 30 minutes. Preheat the oven to 160℃/140℃ Fan/325℉.
Remove from the freezer and bake in the oven for 18 - 20 mins for 10cm/4in cases.
When done, leave in the tins to cool, then remove from the moulds. Fill them with your favourite filling or freeze them for a later date. Enjoy!
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