In a bowl, combine the Plain Flour, Almond Flour and Salt. Whisking to combine thoroughly.
Using a stand mixer with the Flat beater attachment, mix the butter and sugar.
Add in the Egg and once combined, pour in the flour mixture.
When it's all mixed together nicely, form into a ball and wrap in cling film.
Let the dough rest for 30minutes in the fridge.
Take the dough out, roll it out and transfer into a tart pan with removable bottom.
Blind bake (See notes below on blind baking crusts) the crust in a 400°F 200°C Pre-heated Oven