Preheat oven to 375 F
Add flour, salt, baking powder, sugar and baking soda to the food processor
Pulse until all the dry ingredients are well combined
Add very cold cubed butter to the food processor, and pulse until it looks like coarse sand
Pour the flour mixture into a bowl, then add the diced turkey and shredded cheese
Toss all the ingrdients until well combined
Add cold buttermilk to the mixture and mix until it just starts to come together (it will look scraggly at this point)
Turn it all out onto a floured surface
Pat the mixture down and then fold about 3-4 times until the dough starts to come together (Note that you do not need to knead the dough)
Next, pound the dough with the rolling pin until it starts to flatten
Then roll until you get to your desired thickness.
Cut out your desired shape with a knife, bench scraper or cookie cutter
Place the cut out shapes onto a parchment lined baking sheet
Chill in the fridge for 15-30mins
After the cut outs have been resting the fridge for 15-30mins, bring them out of the fridge and brush them lightly with cold buttermilk
Bake at 375F for the first 15mins then reduce to 350F for the last 10 mins
Once the biscuits are baked, bring them out of the oven and let them cool