Cream the butter and sugar in a bowl with a fork until fluffy. Add in the vanilla and baking powder, give it a quick mix and then add in the egg. Beat well until incorporated.
Add in the flour and mix well, first with a fork and then with hand. Keep the dough in the fridge for 30 minutes. In the meantime preheat oven to 375 degrees. Remove dough from fridge. Take a walnut size amount of dough and round it out into a ball with your hands. Place on a parchment line baking sheet. Repeat with rest of dough, allowing a 2 inch space in between each cookie. Rub a small salt shaker (or anything that has round but flat bottom!) into some extra flour. Shake off extra flour and place gently on top of each ball of dough, flattening the dough. The sides will crack, resemling a flower. Repeat for all balls.
Add a tiny amount of jam in the middle of each cookie. My mom literally just adds a small bit- to get the more traditonal effect, feel free to add a lot more!
Bake for 8-10 minutes. Remove from oven and let cool before eating.