In a large bowl, cream butter and sugar, until light and fluffy.
Gradually, add eggs and vanilla and mix well.
Sift together flour, baking powder, and salt.
Stir flour mixture into the butter mixture, until well blended.
Refrigerate the dough for 3 hrs.
Preheat oven to 175 C.
Grease several biscuit sheets.
On a floured surface, roll out 1/2 of the dough at a time to 2 cm thickness.
Cut dough into star shapes using an approx 7 cm star shaped cutter.
Using a 4 cm star shaped cutter, cut a star into the center of half of the big stars.
Sprinkle icing sugar on the biscuits with the center cut out if desired.
Put onto prepared biscuit sheets about 2 cm apart and bake for 6 - 8 mins.
After biscuits cool completely, spread 1 tsp of preserves in the center of each biscuit that does not have a star cut out in the middle.
Place a biscuit with a cut-out on top of the layer of preserves.
Pack biscuits in a covered tin to preserve freshness.