Preheat oven to 180C
80g unsalted butter
½ cup caster sugar
1 cup self raising flour
1/3 cup custard powder
1 teaspoon vanilla essence
2 tablespoon milk
Cream butter and sugar in an electric mixer, add vanilla and milk.
Add sifted flour and custard powder, and mix to form a dough.
Line a baking sheet with baking paper and place teaspoons of the mixture onto the sheet allowing room for the biscuits to spread.
Make an indent in each biscuit with the back of a teaspoon and fill with jam.
Bake for 12 to 15 minutes.