In the bowl, blender, or mixer, combine flour, cubed cold butter, egg, pinch of salt, and milk.
Mix until the dough starts to come together. If necessary, add more milk, 1 teaspoon at a time.
Turn out onto a lightly floured surface and knead into a soft dough.
Form the dough into a disk, wrap it in plastic wrap, and refrigerate for at least 30 minutes.
Preheat the oven to 350°F (180°C). Roll out the dough to about ⅛ inch thick.
Cut circles using a round cookie cutter (about 3 inches in diameter). Place the circles in a mini muffin tin.
Prick the bottom of each shell with a fork and crimp the edges of the shell with a fork.
Place paper cupcake liners on top and fill with rice or lentils, whichever you have on hand.
Bake for 10-12 minutes or until golden. Let them cool completely.