In the bowl of the planetary mixer, mix flour, sugar, baking powder, and salt. Then add butter, eggs, and half a grated lemon zest or 1 teaspoon of natural vanilla flavor.
Mix with the dough hook until the dough is soft and well blended for about 10-15 minutes.
Wrap in plastic wrap and let rest for at least 1 hour. If you can, make it the day before.
Preheat oven to 180C /356F degrees.
Roll out the dough thin (3-4 millimeters) with a rolling pin.
Use a glass or round cookie mold about 9 cm in diameter. You can make smaller raviole or mini raviole.
Arrange a generous teaspoon of bolognese mustard in the center of each cookie, close the dough on itself, forming a half moon, and seal the edges with your fingers or the tines of a fork.
Arrange the raviole Bolognese on a baking sheet lined with parchment paper and bake in the oven for about 12 minutes or until the edges are lightly browned.
Remove the cookies from the oven and let cool before moving them.
Store in a metal box for a couple of weeks.