In a bowl or in the kitchen mixer with paddle attachment, mix the two types of sugar, vanilla and the egg. Add the flour and the butter and keep mixing just until the dough comes together.
Knead the dough lightly by hand on your flour dusted kitchen counter.
Roll out dough on a sheet of parchment paper lightly dusted with flour and set the oven to 325F (170C) and place the baking tray in the middle of the oven.
Depending on size bake them from 15-20 mins. You want them to be light golden brown without being raw in the middle.
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