First. Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9x5 inch loaf pan. In a small bowl, mix together 1/3 cup sugar and 2 teaspoons cinnamon; set aside.
And now, In large bowl combine flour, baking powder, salt and remaining 1 cup sugar. Combine egg, milk, and oil; add to flour mixture. Stir until just moistened.
Next step is, Pour half of the batter into pan. Sprinkle with half the reserved cinnamon/sugar mixture. Repeat with remaining batter and cinnamon/sugar mixture. Draw a knife through batter to marble.
Thanks to: https://www.allrecipes.com/recipe/23376/cinnamon-swirl-bread/?utm_source=pinterest.com&utm_medium=social&utm_campaign=allrecipes_allrecipes_16117906&utm_content=baking_verticalimage&utm_term=bestofbreads_201907