Preheat the oven to 350°F. Line a 9x5-inch loaf pan with parchment paper and spray with non-stick spray.

In a medium bowl, whisk together flour, baking powder, baking soda, and salt.

In a large bowl, combine milk, vegetable oil, sour cream, sugar, egg, and vanilla. Mix until smooth.

Gradually add dry ingredients to wet ingredients and fold until just combined.

In a small bowl, mix remaining sugar and cinnamon. Set aside.

Pour one-third of batter into prepared pan. Sprinkle with one-fourth of cinnamon sugar mixture.

Repeat layering two more times, ending with cinnamon sugar topping.

Bake for 55 minutes or until a toothpick inserted comes out clean. Cool before slicing.