Place the shredded cheese, flour, salt, garlic powder, and butter into a large bowl. Mix lightly with a fork then use a pastry blender or your hands to cut all of the ingredients together, breaking the butter into small chunks throughout. Work quickly to ensure the dough stays cold. Add water, 1 tablespoon at a time, until the mixture comes together to form a ball. Divide into two discs and wrap in plastic wrap. Refrigerate for at least 1 hour.
Food Processor: If you have a food processor, it can make this process easier. Pulse the ingredients together, adding water until the dough forms a ball. Divide in half, wrap in plastic, and refrigerate for at least 1 hour.
Once the dough is chilled, preheat the oven to 375ºF. Flour the counter and use a rolling pin to roll out one half of the dough, adding more flour if anything sticks. Roll the dough as thin as you can without seeing through it. Use a sharp knife or a pizza cutter to slice horizontal and vertical lines, creating small squares across the dough (see images in the blog post). Use a bench scraper to lift the squares and place them on a parchment-lined baking sheet.
Arrange squares so that they do not overlap. Use a chopstick or skewer to create a hole in the centre of each cracker. This is optional and just for the classic Cheez It look. Sprinkle with more salt and repeat with the second dough disc.
Bake the Cheez Its at 375ºF for 14-16 minutes until crisp. Keep an eye on them to avoid browning, you want them to be a nice golden orange.
Remove from the oven and allow to cool on the baking sheet for 5 minutes before transferring the crackers to a cooling rack to cool completely. They will crisp up as they cool. Enjoy!