Sprinkle yeast in the starter and stir. Add sugar and stir. Add salt and stir. Add baking powder and baking soda and stir. Add oil and then gradually add flour, stirring well after each addition. Place dough on a floured board and sprinkle more flour on top of dough. Flatten dough by hand to about 1/2-inch thickness and then cut with a biscuit cutter. Spray a 16-inch Dutch oven with non-stick cooking spray and then add a little oil to the bottom of the Dutch oven. Place biscuits in Dutch oven, being careful not to overcrowd them. Top with melted butter and set aside to let rise until wrinkles are gone, about 1 hour. Bake, with coals on the lid, for 25 or 30 minutes or until golden brown.