01 -
Heat the oven to 350 F. Line 2 baking sheets with parchment paper.
02 -
Add the flour, kosher salt, smoked paprika, cayenne, dry mustard, and garlic powder to a food processor. Pulse a few times to combine.
03 -
Add the grated cheddar and pulse until evenly mixed. Add the cold butter cubes and pulse until the mixture looks like damp sand with tiny butter pieces.
04 -
Squeeze a little mixture in your hand. If it holds together, stop. If it crumbles apart, pulse in cold water 1 teaspoon at a time until the dough just clumps.
05 -
Turn the dough onto parchment, press it into a disk, wrap it, and chill for 20 minutes so it rolls cleanly.
06 -
Roll the dough on a lightly floured surface to about 1/8 inch thick. Cut into 1-inch squares or small rectangles and prick each cracker once or twice with a fork.
07 -
Transfer the crackers to the prepared pans. Bake for 13-16 minutes, rotating the pans halfway through, until the edges are lightly golden.
08 -
Sprinkle lightly with flaky salt or a pinch of paprika while warm, if using. Cool completely on the pan before serving or storing.