Measure the cheese – this recipe is not one to measure cheese with your heart. Any hard cheese will work like mild cheddar, sharp cheddar, white cheddar, parmesan, asiago, Swiss, etc.
Pulse cheese, flour, cornstarch, baking powder, sugar, and salt in a food processor until no large pieces remain. Add butter and pulse until crumbly.
Add ice water. Pulse until absorbed. The dough will still be very crumbly.
Place four large pieces of plastic wrap on your counter. Divide the dough between the four pieces. Use the plastic wrap to shape the dough into a large flat rectangle about 1/8 inch thick. Seal up the wrap and use the rolling pin to help flatten the dough inside the wrap.
Chill for at least one hour. Can freeze at this point as well. If you choose to freeze the dough, when you are ready to bake, remove the dough from the freezer about 10-15 minutes before trying to work with it.
Preheat oven to 350
Place a piece of parchment on the counter. Lightly dust with flour. Add one piece of the chilled dough. If needed, roll the dough until it is even and 1/8 inch thick or less. Only roll in one direction, not back and forth or it will separate the dough.
Using a pizza cutter, cut the dough into one-inch rectangles. Place the parchment onto a cookie sheet. Poke holes in the cracker with a fork or knife. Spread the pieces out on the parchment. Use the edge of the pizza cutter to help move the pieces around without stretching or squishing the dough.
Bake for about 15 minutes. Start checking the crackers at 10 minutes because you don't want to burn them. If the edges start to darken, they are done. They will feel crisp to the touch when they are done as well.
Let the crackers cool on the cookie sheet. They will get crispier after they cool.