Mustard Cheddar Crackers

Directions

1. 1
   A food processor makes this come together in a snap but the dough can be made by hand.
2. 2
   Blend together until smooth the butter, cheese and egg yolk.
3. 3
   Add remaining ingredients and pulse until just blended. (If your food processor is small, you may have to do this in batches.). Transfer dough (it will be very soft) to a bowl and chill for 15 minutes.
4. 4
   Halve dough and on a lightly floured surface, shape each half into a 12-inch log.
5. 5
   Wrap logs in waxed paper then in foil and chill until firm, at least 4 hours. If you plan to freeze them, now is the time.
6. 6
   Place oven racks in upper and lower thirds of oven. Preheat oven to 350°F. Line 2 large baking sheets with parchment paper.
7. 7
   Unwrap logs and with a sharp, thin knife cut into 1/8-inch-thick slices. Arrange slices 1-inch apart on baking sheets.
8. 8
   Bake in batches, switching position of sheets halfway through, baking until golden brown, 12-15 minutes.
9. 9
   Transfer to racks to cool. Line sheets with clean parchment between batches.
10. 10
    Crackers, cooled completely, keep in a airtight container at room temp 1 week.