Combine flour, baking powder, and salt into a large mixing bowl.
Add in the flour, either shred it using a cheese grater or cut it into small pieces. Toss with flour to coat until crumbly.
Pour in buttermilk and stir until combined. The dough will be very sticky.
Heavily flour a work surface and scoop out the ball of dough.
Roll out to about 1/4 inch in thickness, adding more flour as needed to avoid sticking.
Using a pizza cutter or knife, cut horizontal lines all the way across the dough about every 1 to 2 inches.
Next, cut vertical lines all across the dough about every 1 to 2 inches. You will be left with a bunch of little squares of dough.
Pour the stock into the pot and bring it to a boil.
Carefully drop the dumplings in a few at a time and stir well. They will begin to cook quickly and float to the top.
After a few minutes when the dumplings are plump, stir in the shredded turkey meat and stir well.
Season with salt and pepper as desired and serve warm