Put the cheddar, flour, butter, salt, seasoned salt and cayenne in a food processor and pulse until the mixture resembles sand. Add the ice water and pulse until the dough comes together. Form the dough into a ball, wrap in plastic and refrigerate for 1 hour.
Preheat the oven to 350 degrees F. Line a baking sheet with a silicone baking mat.
Roll out the dough to 1/4-inch thickness and cut into squares with a pizza cutter. Use a wooden skewer to poke a small hole in the center of each square. Transfer to the prepared baking sheet and bake until golden brown, 15 to 17 minutes. Allow to cool before packing up.