8 tbsp of self-raising flour, plus extra for dusting
4 tbsp of jam, any flavour
Preheat the oven to 180°C/gas mark 4, and lightly grease a baking sheet
Cream the butter and sugar together in a mixing bowl with a wooden spoon until softened and well combined. Add the egg yolk and the peanut butter, and mix until evenly distributed through the mixture. Spoon in the flour and stir to make a soft dough
With lightly floured hands, break off a walnut-sized piece of dough. Place on the prepared baking sheet and flatten slightly with a fork. Repeat with the rest of the dough
Using your thumb, or a teaspoon, make a deep well in the centre of each flattened ball of dough; the cookies will flatten and spread out slightly at they cook, so don't be afraid to dig in!
Melt the jam slightly in a microwave for 30 seconds on a low setting, then spoon a little into the centre of each cookie. Bake in the centre of the preheated oven for 10 or so, until golden