Preheat oven to 350°. In a food processor, combine cheese, butter chunks, flour and salt. Pulse until mixture looks crumbly.
Pour the milk through the top of the food processor. Mix until dough starts to stick together.
Pour the milk through the top of the food processor. Mix until dough starts to stick together.
Flatten the balls into disks between sheets of plastic wrap. Wrap them up, and refrigerate for at least 10 minutes (or up to 3 days).
Roll dough to ¼-inch thickness. (If it’s too hard to roll, let it soften on the counter for a few minutes.)
Cut dough into 1-inch squares with a knife or a pastry or pizza cutter (or cut into shapes with a small cookie cutter).
Place crackers on a baking sheet lined with parchment paper. Wiggle a toothpick in the center of each square to make a hole. Bake for 8–12 minutes, or until crispy. Cool on the pan for a few minutes before serving.