Using a food processor fitted with a grating blade, grate 8 ounces sharp cheddar cheese. If you don’t have a food processor, a box grater works well too.
Remove the cheese from the food processor and fit it with a dough blade. Add the grated cheese back in along with 4 tablespoons unsalted butter, ½ teaspoon kosher salt, and ¼ teaspoon onion powder. Pulse until the mixture resembles coarse sand.
Add 1 cup all-purpose flour and pulse 2 to 5 times until the dough comes together.
Add 2 tablespoons cold water and pulse again for 2 to 3 times until a dough forms.
Turn the dough out onto a floured surface, shape it into a flat disk, cover with plastic wrap, and chill for at least 1 hour.
Preheat your oven to 350℉/175℃.
Roll the chilled dough between two pieces of parchment paper to about ⅛-inch thick.
Cut the dough into ~1-inch squares and poke a hole in the center of each.
Place on a baking sheet and bake for 10 to 13 minutes until edges are slightly browned.
Let cool completely before enjoying your Homemade Cheez-Its.
