Peel and dice the apple into 0.5cm cubes.

Mix the apple, sugar, and cinnamon powder in a heatproof bowl.

Cover the bowl with plastic wrap and poke holes using a toothpick.

Microwave the mixture at 600W for 5 minutes.

After microwaving, stir the mixture again and refrigerate until ready to use.

Cream the softened butter and sugar in a bowl.

Add the egg yolk and vanilla extract, mixing thoroughly.

Add all the dry ingredients and mix with a spatula until just combined.

Wrap the dough in plastic wrap and refrigerate for 30 minutes.

Roll out the dough to a thickness of 0.3cm.

Cut out circles using a 6cm cookie cutter.

Place 1 tsp of apple filling onto each cookie base.

Cover with another cookie circle and press the edges to seal.

Crimp the edges with a fork for decoration and sealing.

Bake at 170°C for 12 minutes.