In a mixing bowl whisk together the flour, powdered sugar, baking powder and salt.
Make a well in the middle and add the vanilla, cream and yolk, mix together with flat beaters or even a fork or spatula, until a soft compact dough forms. Move to a flat surface and knead gently a few times to bring the dough together.
Remove pieces, roll into ropes, approximately 8 inches (20cm) long, cross the rope in the middle 1-2 times. Place the formed cookies on the prepared cookie sheet, sprinkle with cane or granulated sugar, chill while the oven is pre-heating, approximately 15-20 minutes.
Pre-heat oven to 350F (180C).
Remove from the fridge and bake for 12-15 minutes or until golden brown. Let cool 5 minutes on the cookie sheet, then move to a wire rack to cool completely. Enjoy!
The dough can be made 2-3 days ahead of time and stored in the fridge. Knead a few times to make it easier to form the cookies.Store the cooled cookies in an airtight container at room temperature for up to 3-4 days.Freeze the completely cooled cookies in a freezer safe bag or container. They will keep for up to 2 months in the freezer.