Preheat oven to 450 degrees F with the rack in the center position.
Line a baking sheet with parchment paper, and set aside.
In a food processor, add flour, sugar, baking powder, salt, and baking soda.
Pulse to combine.
Add chunks of butter and shortening, and pulse until mixture resembles a coarse sand. (About 15 pulses)
Transfer mix to a mixing bowl, and stir in buttermilk until just combined.
Turn dough onto a floured surface, and knead 8-10 times to form a smooth, cohesive ball of dough.
Roll dough out to ¾ inch thickness.
Use a 2 inch or 2 ½ inch biscuit cutter, to cut out rounds, be sure to not twist the cutter.
Gather dough scraps and roll to ¾ inch thick. And repeat until all dough is cut into rounds.
Take each round, flip it over and place all 12 on lined baking sheet.
Place in preheated oven and bake for 5 minutes, then turn oven down to 400 degrees, and let bake until golden brown, about 10-12 additional minutes.
Remove from oven and cool for 5 minutes.
The top with prepared sausage gravy.
Garnish with fresh parsley and enjoy!