Whisk the butter and sugar with a mixer. Add egg, vanillin, milk and shake everything.
In a separate bowl, sift together flour, baking soda, baking powder and salt. Add the flour to the whipped mixture to make a batter.
Add oatmeal, cinnamon, lemon zest (grated) to the dough and mix everything properly. Add dried fruits, chocolate, etc. to the dough.
Preheat oven to 175 ° C. Lightly grease the pan with grease or cover it with baking paper.
Spoon the dough into a baking tray. Make small tortillas, about 4 cm in diameter. Leave a distance of about 7 cm between the cookies for better baking.
Bake for about 10 minutes until golden brown.