Add brown sugar and butter and cut into flour with pastry blender or 2 knives.
Add milk gradually, tossing with fork to moisten evenly. Add a few drops more milk if mix seems dry. It should not stick to the bowl or your hands.
Divide dough into 4 pieces and press each into a ball and flatten slightly.
Place each cake of dough between 2 pieces of wax paper and roll with rolling pin to about 3/16 inch thickness.
Peel off top piece of wax paper and flip dough over onto ungreased cookie or pizza sheet.
Cut into squares or any shape you like. A pizza cutter is good for this.
Prick all over with a fork, then bake at 375 degrees until lightly browned, about 8-10 minutes Watch closely because crackers brown quickly. If the crackers on the outside brown before the center, remove the outer crackers and continue to bake the rest.
VARIATIONS: For variety, you can add herbs to the dough, or sprinkle crackers with poppy, caraway or sesame seeds before baking.