Preheat oven to 180℃ (160℃ fan forced). Line 2 large baking trays with baking paper.
Place the butter, sugar and vanilla into a food processor and process until smooth and lightly creamy.
Add the flour, baking powder and egg and process until a smooth dough forms. Turn dough out onto a clean surface and gently to bring together with your hands.
Roll 2 teaspoonful of mixture into balls (mine weighed around 15g each) and place onto prepared trays leaving a little room for spreading (about 5cm). Using your thumb or fingertip, making an indent in each round whilst slightly flattening. Fill each indent with a small amount of jam (about ¼ teaspoon). Do Not Overfill. Chill in the fridge for at least 15 minutes or until ready to bake later on.
Bake the biscuits in the oven for 12-15 minutes or until lightly golden. Allow to cool on trays for 10 minutes before transferring to a wire rack to cool completely. Store biscuits in an airtight jar or container for up to 1 week.