1. Preheat oven to 400°.
2. Combine first 3 ingredients in a medium bowl; let stand 1 hour. Stir in egg substitute, brown sugar, and oil.
3. Combine flour and next 3 ingredients in a large bowl, and make a well in center of mixture. Add buttermilk mixture to flour mixture, stirring just until dry ingredients are moistened.
4. Spoon batter into muffin pans coated with cooking spray, filling two-thirds full. Bake at 400° for 20 minutes or until golden. Remove muffins from pans immediately.