In a medium bowl, mix together the flour and the baking powder. Set aside. Line two baking sheets with parchment paper or silicone baking mats and set aside.
Cookies: In the bowl of a stand mixer, beat together the butter and sugar. Add in the whipping cream, egg and vanilla extract. If the mixture is crumbly, keep mixing or add more whipping cream. My mixture was super crumbly, but it eventually came together with time.
Knead the dough into a ball. Place one sheet of wax paper on your table and place the dough ball on top. Place another piece of wax paper on top. (The wax paper is to create a smoother sugar cookie). Roll the dough out using a rolling pin until desired thickness.
Cut the dough using cookie cutters, and place on the prepared baking sheets.
Preheat the oven to 350˚F. While the oven is preheating, place the baking sheets in the freezer to chill. This is so the cookies will keep their shape better.
When the oven is preheated, place the baking sheets in the oven, and bake for 7-10 minutes. Remove from oven, and allow to cool on the baking sheets for 2 minutes, then transfer to wire racks to cool completely.
Icing: In a medium bowl, cream together the icing ingredients until fully combined. Frost on cooled cookies. Add some jujube hearts or other candies for decoration.