How to make it?
1. In a food processor, process together butter with flour, baking powder, powdered sugar, vanilla extract and salt to a crumbly mixture.
2. Add in the milk gradually and process until a unified dough is formed. Begin with a 1/4 cup of milk, if dough is still dry and crumbly add in the remainder of the milk. Try and process as little as possible
3. Wrap the dough in plastic wrap and refrigerate for 1-2 hours.
4. Heat the oven to 180C/350F/gas5
5. On a parchment paper roll out the pastry 3mm thick. With a cookie cutter or a glass stamp out 8 cm/3 in rounds.
6. Place about a 3/4 tsp of filling in the center of the round and pinch the sides into a shape of a hamentashen.
7. Place on a baking paper lined baking sheet, spaced evenly apart and bake for appx. 15-20 minutes until the edges are golden but the hamentashen is still light.
8. Cool down to room temperature, dust with powdered sugar and serve.
9. Keep in an airtight container in room temperature.