You can use lemon or orange zest for additional flavor.
Whisk a butter, zest and sugar with mixer on a low speed. After, add eggs and flour (step by step). Knead the dough, wrap it in a plastic and keep in a fridge for a half hour.
Roll out the dough, cut out desired shapes.
Preheat an oven, bake cookies for 6-10 minutes, at 180 degrees.