Combine first 5 ingredients in a medium bowl, and make a well in center of mixture.
Combine buttermilk, margarine, and egg, and stir well.
Add to the flour mixture, stirring just until moistened.
Spoon about 1 tablespoon batter into each of 12 muffin cups coated with cooking spray. Spoon 1 teaspoon preserves into center of each muffin cup (do not spread over batter), and top with remaining batter.
Combine 1 tablespoon sugar and 1/4 teaspoon cinnamon; stir well.
Sprinkle evenly over muffins.
Bake at 400 for 20 minutes or until muffins spring back when touched lightly in center.
Remove muffins from pans immediately, and place on a wire rack.