To make biscuits, mix flour, baking soda, baking powder, buttermilk, shortening, butter and salt together in a large bowl, and mix to combine the ingredients. Place spoonfuls of the dough on a baking pan, and cook at 400 degrees for 15 to 20 minutes.
To make biscuits, place 2 cups of all-purpose flour, 4 teaspoons of baking powder, 1/4 teaspoon of baking soda and 3/4 teaspoons of salt into a large bowl, and mix to combine the dry ingredients. Add 2 tablespoons of cold butter and 2 tablespoons of chilled shortening. It is necessary to work quickly to prevent the butter and shortening from melting, which affects the texture of the biscuit after cooking.
Cut the butter and shortening into the flour with a fork, or work the butter and shortening into the flour with the hands, until the mixture becomes crumbly in texture and appearance. Add 1 cup of cold buttermilk to the mixture, and mix until the ingredients are combined. Do not over-mix the dough.
Drop the dough onto a baking sheet using a spoon or measuring cup, depending on the size of biscuit desired. Allow space between each spoonful of dough, and bake the biscuits at 400 degrees Fahrenheit until the tops are golden brown, or for approximately 15 to 20 minutes.