In a large bowl, combine the flour, 1 cup sugar, baking soda, and salt together, set aside.
In a medium bowl, combine the buttermilk, egg, butter extract (optional) and oil, then add in the dry ingredients just until moistened. Do not overmix.
Spray with non-stick spray a 9X5 loaf pan and pour in half of the batter.
Sprinkle with 2/3rds of the cinnamon sugar mix on top of the batter and then top with remaining batter.
Sprinkle top of bread loaf with remaining cinnamon sugar and cut through batter with a knife to swirl the cinnamon around into the batter.
Bake at 350 for 50-60 minutes until done in middle using a tester or feel the top with your finger tip to make sure it's firm and baked through.
Let cool on a baker's rack for 20 minutes or more before slicing. Yum! Great warm or room temperature!