Preheat oven to 425°.
Combine first 6 ingredients in a bowl; make a well in center of mixture. Combine buttermilk, egg substitute, and oil; add to dry ingredients, stirring just until dry ingredients are moistened.
Spoon batter into 12 muffin cups coated with cooking spray, filling three-fourths full. Bake at 425° for 14 minutes or until golden. Remove muffins from pans immediately, and serve warm.