Mix the butter with the sugar in a bowl for 5 minutes.
Add the vanilla and egg and give it a good mix.
Stir in the almond flour, followed by the all-purpose flour and salt and knead just until the dough looks even.
Gather it into a ball then wrap it in plastic wrap and refrigerate for a few hours, preferably over night.
Once chilled, roll the dough into a thin sheet then cut small pieces and use them to make your tartlet shells by placing the dough into small tartlet rings.
Work the dough quickly to prevent it from warming up. If it's too warm, keep it in the fridge then work it again.
Bake in the preheated oven at 170C for 12-16 minutes or until slightly golden brown.
Allow to cool down in the pan then remove the rings and place aside until needed.