Combine the flour, sun-dried tomatoes, nutritional yeast, dried minced onion, dried chives, baking powder, garlic powder, salt and baking soda in a mixing bowl.
Cut in the shortening with a pastry blender until mixture resembles coarse crumbs.
Whisk tomato paste into the buttermilk then add the liquid to the dough, just mixing enough for the dough to come together.
Pat the dough out onto a lightly floured surface about a half inch thick and cut biscuits out with a floured ring cutter.
Place biscuits onto a parchment lined baking sheet.