To make the dough, start by adding the gluten-free flour, extra sharp cheddar cheese, Parmesan cheese, and salt in the food processor. Pulse until well formed crumbs appear.Add the unsalted cold butter and pulse again until coarse crumbs forms.Add the cold milk and pulse again.Remove the dough from the food processor.On a flat surface start to form dough with your hands and divide into two portions.Wrap them in plastic film and let them chill for 30 minutes or more.Roll the dough on a floured surface, start cutting out tiny fish shapes, and transfer them to a baking sheet.To make a happy fish, draw a little smile on the dough.With the oven pre-heated to 350 F degrees bake them for about 10 to 13 minutes. You want them crispy, crunchy, and gold.After you remove them from the oven, let them cool down completely.Using only one portion of the dough, I baked appropriately 120 tiny fish crackers.Using the other portion of the dough, cut straight lines on your rolled dough using a fluted pastry wheel.Used a ruler to guide you and a pastry tip to poke the dots in the middle of the dough.The homemade Cheez-it crackers will require to be baked approximately 13 to 15 minutes in the oven.You will have approximately 60 small homemade Cheez-it crackers.