Sift together 1 cup flour, baking soda, baking powder, and cheese powder in a large bowl.

Cut in the shortening with a fork and knife with a crosswise motion until the dough is broken down into rice-size pieces. Mixture will still be very dry.

Stir in buttermilk with a fork until the dough becomes very moist and sticky.

Sprinkle a couple tablespoons of the reserved flour over the dough and work it in until it can be handled without sticking, then turn it out onto a floured board, keeping 1/4 cup of the reserve flour for later. Knead the dough well for 60 to 90 seconds, until the flour is incorporated. Wrap the dough in plastic wrap and chill for at least one hour.

Preheat oven to 325 degrees. Spray a light coating of cooking spray on a baking sheet.

Remove the dough from the refrigerator and use the remaining reserve flour to dust a rolling surface. Roll about one-third of the dough to just under 1/16th of inch thick. Trim the edges square, then transfer the dough to a lightly greased baking sheet.

Use a pizza cutter to cut across and down the dough, creating 1-inch square pieces. Use the blunt end of a skewer or broken toothpick to poke a hole in the center of each piece.

Sprinkle a very light coating of salt over the top of the crackers and bake for 8-10 minutes. Mix the crackers around and bake for another 3-5 minutes, or until some are just barely turning a light brown. Repeat the rolling and baking process with the remaining dough.