Cream up your butter and sugar on on a medium speed until light and fluffy.
Add the egg and mix until combined then sift in the flour and mix to form a dough.
Roll the dough on a lightly floured surface until about 5mm thick. Using a round cutter which is a little bigger than the cups on your bun tray. Gently press the cut pastry circles into the pre-greased cups, taking care not to trap and air under them.
Spoon your required jam into a bowl (whether one kind or several - use separate bowls) and add a dash of water to the jam and mix well. Spoon a tablespoon of jam into each prepared pastry, filling to around 2/3 full.
Bake in your pre-heated oven for 10-12 minutes until the pastry edges are golden. Leave to cool in your tray.