Preheat oven to 425°. In a large bowl, combine flour and baking soda. Stir in sour cream and oil just until moistened. Turn onto a floured surface; knead 4-6 times. Roll out to 3/4-in. thickness; cut with a 2-1/2-in. biscuit cutter.
Place on a greased baking sheet. Lightly spray tops with cooking spray. Bake 10-12 minutes or until golden brown.
As a substitute for 1 cup of self-rising flour, place 1-1/2 teaspoons baking powder and 1/2 teaspoon salt in a measuring cup. Add all-purpose flour to measure 1 cup.