Preheat the oven to 350F. Grease a 9x5-inches loaf pan with non-stick cooking spray and line it with parchment paper (this will help remove the bread from the pan after baking).

Prepare the cinnamon swirl. In a small bowl, mix together sugar and cinnamon. Set aside.

Prepare the bread batter. In a large bowl, mix together the dry ingredients (all-purpose flour, granulated sugar, baking powder, baking soda, and salt).

In another bowl, whisk an egg, then whisk in milk, vegetable oil, and vanilla extract. Pour into the dry ingredients. Stir until just combined.

Pour ⅓ of the bread batter into the prepared pan, and top with half of the cinnamon swirl mixture. Then, pour the remaining batter and top with the remaining cinnamon/sugar mixture.

Using a skewer or a knife, swirl it around the batter to create a nice pattern. Bake for 45-55 minutes or until the toothpick inserted into the center of the bread comes out clean. Remove from the oven and let the cinnamon quick bread cool to room temperature. Then, remove from the baking pan, slice, and serve.