Preheat oven to gas 7 / 210C / 425°F and line a baking sheet with parchment
Roll out the pastry between 2 pieces of parchment paper into a large rectangle around 3mm thick
https://cookpad.com/us/recipes/332957-vickys-sweet-savoury-shortcrust-pastry-gf-df-ef-sf-nf
Cut into an even number of smaller rectangles around 4"tall x 3" wide. Keep re-rolling the pastry until you've got 12 or 14 rectangles
Put a heaped tsp of jam on top of half of the rectangles and spread slightly, keeping a border around the edges of about half a cm
Use a little milk or water to wet the border them place a plain rectangle on top
Crimp around each edge with a fork, brush with a little more milk and prick the tops a few times
Bake for 8 - 10 minutes or until golden
Meanwhile mix a tbsp or so milk with the icing sugar to make a thick glaze
Let the pastries cool a little, then spoon the glaze over and decorate with sprinkles
You can use peanut butter or chocolate spread with chocolate sprinkles too
