1. Preheat the oven to 350F.
2. In a mixer, beat the butter and sugar together for 4 minutes.
3. Add the whole egg and then the vanilla, mix and add the milk.
4. Add the flour previously mixed with the baking powder, sodium bicarbonate, and salt.
5. Transfer the preparation to a pastry bag with a simple nozzle.
6. On a baking sheet with parchment paper, form small spaced heaps of dough.
7. Bake for 10 minutes. Let cool on a rack.
8. Fill half of the cookies with cream.
9. On the other half of the cookies, draw faces.
10. Let the glaze rest for 5 minutes. Assemble the cookies and serve.