In a large mixing bowl or the bowl of a stand mixer fitted with the paddle attachment, sift the flour and powdered sugar. Add the salt, almond flour and vanilla beans, then mix.
Add the cold butter cut into small cubes, then rub the mixture together with your hands or use the stand mixer to work it until you get a breadcrumb-like texture, with no lumps of butter remaining.
Add the beaten egg and mix briefly until the dough begins to form. If the dough is dry, add a little more egg.
Note: Don't overwork the dough to avoid activating the gluten, as this can cause the dough to collapse in the mold.
Turn the dough onto the work surface and press it with the palm of your hand, pushing it forward 2 to 3 times to obtain a smooth dough without pieces of butter
Form into a ball, flatten into a disk and wrap in cling film. Leave to rest in the fridge for at least 2 hours.
Roll out the dough between two sheets of parchment paper to a thickness of 2-3 mm, making it slightly larger than your tart ring. If it sticks, firm it up in the fridge.
Place the rolled-out dough into the buttered tart ring, preferably set on a perforated baking sheet, and lined with a Silpain mat or parchment paper. Press well on the sides and bottom of the mould to form a right angle. Trim the excess dough with a rolling pin, then level the edges with a knife for a neat finish.
Place the mold in the freezer for 30 minutes to 1 hour.
Bake blind or go straight to the filling. Preheat the oven to 160°C (320°F) fan-assisted or 170°C (340°F) static.
Bake for about 15 minutes, until lightly golden, then cool before garnishing. I slightly exceeded the baking time for the small tart because usually, the crust should be a little less golden