Preheat oven to 170 degrees celsius (fan-forced). Grease and line two baking trays with baking paper.
Cream the butter and sugar for 20 seconds, Speed 4. Scrape down the sides of the bowl and repeat for a further 20 seconds, Speed 4.
Add egg and mix for 10 seconds, Speed 4.
Add flour and baking powder and mix for 20 seconds, Speed 5.
Roll the mixture into small balls (2 teaspoons of mixture per ball).
Place the cookie balls onto the baking trays and use the tip of your little finger to create an indent in the middle that goes apprximately one-third to one-half of the way down).
Place a very small (TINY!) amount of jam into each indent.
Place the trays into the fridge and chill for 30 minutes.
Bake the cookies for approximately 10 minutes or until lightly golden.
Leave the cookies on the baking trays for 10 minutes and then transfer to a wire rack to cool completely.