Prepare the base:
Mix the flour with the powder and salt. Next we need to incorporate the cooled butter into the flour. The condition of the butter should be such that it holds its shape, but breaks when pressed hard. I grind the flour and butter with my hands until fine crumbs, but you can do this in a stationary mixer with a whisk attachment.
When the crumbs are ready, add the egg or applesauce and try to mix everything quickly until the dough starts to ball. Do everything quickly, so that the heat of your hands does not begin to melt the butter.
Cover the bottom of the form with parchment and transfer the dough. Next, evenly smooth it over the bottom and sides of the mold. You can use a jar or a mug to make even edges.
When the base is ready, bake it for 15-20 minutes at 180 degrees on medium oven level and then cool completely.