Preheat oven to 425F
Mix together flour, salt, baking powder and seasonings. Using a medium cheese grater, gate in cheddar cheese and toss in the flour and then using a coarse cheese grater, grate the frozen butter into the flour and toss in flour. Pop the bowl in the fridge for about 15 minutes to allow the butter to solidify again.
Combine chilled sourdough discard and buttermilk. Removed flour mixture from Step 2 from the fridge and add the sourdough mixture to it. Mix and then use your hands to press everything into a shaggy dough. If the mixture is too dry, add a few drops of cold water. Avoid over working the dough.
Flatten dough into a rectangle and cut it in half. Stack the dough on top of each other. Flatten again and repeat. This will create your layers. Flatten one last time, making the dough about 1 1/2 inch thick. Cut in half to make 2 even pieces and place them on a linned baking sheet.
Bake for 15 minutes or until the tops are pale brown or, if your prefer, when they are golden.