Mix cake flour, sugar, baking powder, and salt in a bowl.
Cut the cold butter into small pieces and mix well with your hands or a dough mixer.
Add heavy cream and gently bring the dough together.
Place the dough on a board, flatten it to about 2-3cm thick, and cut into desired sizes.
Bake in a preheated oven at 180°C for 20-25 minutes.
Let them cool to finish.