Place plain flour, milk powder, caster sugar, and salt in a mixing bowl, pulverise Turbo/2 sec/1 time.
Add butter, mix 5 sec/speed 5.
Add egg yolks, mix Dough /20 sec
Transfer dough to a bowl, cover with cling film, and refrigerate for 30 minutes. Prepare your baking trays and line with baking paper. Preheat oven to 170°C.
Roll the dough onto a floured surface to be around 1cm thick. Use a round cookie cutter or pineapple tart cutter and cut the rounds. Place tarts onto the baking trays with baking paper
Place the chilled pineapple balls onto the tarts.Using a pastry brush, brush pastry surface with lightly beaten eg
Bake for 20 minutes (170°C) until lightly brown. Allow to cool completely on a cooling rack before serving or storing in an airtight container.