Pre-heat oven to 350 degrees and prepare a bread pan by spraying it with non-stick cooking spray or lightly greasing it with butter. In a large bowl combine flour, baking powder, salt, and sugar.
In a small bowl combine egg, milk, vanilla extract and yogurt or sour cream.
Add the dry ingredients into the wet and stir to combine. You can use a large wooden spoon for this if you wish, no mixer is required.
In a small bowl combine swirl ingredients together – 1/3 cup sugar, 2 teaspoons cinnamon and 2 tablespoons water. Use a tablespoon to drop spoonful’s of this mixture over the bread, then use a knife to make swirl designs to incorporate the cinnamon mixture into the bread.
Bake for 45-50 minutes or until you insert a toothpick and it comes out clean. Remove the bread from the oven and transfer it to a cooling rack to cool for 15 minutes. Remove the bread from the pan and allow it to continue cooling complete.