There are various recipes of shortbread. For the dough: 250 g margarine or homemade butter (room temperature), 1 cup powdered sugar, 3 cups flour, 1 tsp vanilla extract.
In a bowl, combine sugar, margarine/butter. Then add vanilla and knead. Add flour slowly and knead to make the dough smooth and soft.
Then follow the pictures
Some of them I decided to make in this forms with hazelnuts