Pre-heat oven to 350 degrees.

Combine the flour, 1 cup sugar, baking soda and salt in a large bowl.

In a seperare bowl, mix together buttermilk, egg and oil. Stir into flour mixture until blended.

Mix together cinnamon and ½ cup sugar in small bowl.

Spray the bottom of a loaf pan with cooking spray.

Pour half of the batter into pan then sprinkle ⅔ of the cinnamon swirl mixture.

Pour remaining batter and sprinkle with remaining cinnamon swirl mixture.

Take a knife or spatula and cut through batter to swirl.

Bake for 60-70 minutes or until a toothpick inserted comes out clean (cooking times vary).

Cool for 10 minutes in pan, then remove and place bread loaf on wire rack.

Place powdered sugar in a bowl and slowly add in milk, stiring until you get to syrup consistency. Drizzle over loaf.