1. Preheat oven to 425°.
2. Cook bacon in a 9-inch cast-iron skillet over medium heat until crisp. Remove bacon from pan, reserving 1 tablespoon drippings. Discard remaining drippings, but do not wipe out pan. Crumble bacon; set aside.
3. Place pan in oven at 425° for 8 minutes.
4. Lightly spoon flour into dry measuring cups, and level with a knife. Combine flour and next 5 ingredients. Combine sour cream, buttermilk, 1 tablespoon reserved drippings, and egg substitute, stirring with a whisk. Add to flour mixture, stirring just until moist. Gently fold in bacon; pour batter into preheated pan.
5. Bake at 425° for 20 minutes or until golden. Cut into 8 wedges.