Preheat oven to 200ºC F. In a large bowl, sitr together flour, baking powder, baking soda, salt and sugar. Stir in cheese; set aside. In a medium bowl, beat egg. Stir in sourdough starter, milk and oil or drippings. Add to flour mixture. Stir with fork until dry ingredients are just moistened. Fold in crumbled bacon. Fill prepared muffin cups two third to 0.75 full with batter. Bake in preheated oven 20 to 25 minutes or until golden brown. Remove from muffin cups. Serve hot. Great for breakfast with a glass of orange juice! These turned out absolutely WONDERFUL. I would suggest greasing the muffin tins very well. The cheese tends to make them stick a little! Formatted to MM by SALlie Kratz. From THE SOURDOUGH COOKBOOK by Rita Davenport.