Preheat oven to 350. Spray a 9x5 loaf pan with non-stick spray.
Make the Swirl: In a small bowl, combine cinnamon, brown sugar and granulated sugar; set aside.
Make the Quick Bread: In a large bowl, combine the flour, sugar, baking soda, and salt; set aside.
In a medium bowl, combine the buttermilk, eggs, butter extract (optional) and oil, then add in the dry ingredients just until moistened. Do not overmix.
Pour in half of the batter into the prepared loaf pan. Sprinkle with 2/3rds of the cinnamon sugar mix 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.
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 10 minutes before glazing and slicing.
To make glaze, add ingredients together and whisk to get the consistency you want. Add extra powdered sugar or milk accordingly and drizzle on top of your loaf.