After mixing, add the flour and baking powder, melted butter, vanilla extract, and lemon zest and mix it until it's all smooth. If, in any case, the batter is too thick, add around 80 ml of milk.

Pour the mixture into the silicon shaped trays and bake them at 190°C for 10 to 18 min. After baking, let them cool down on the baking trays before moving them to a plate.