Preheat the oven to 350 F, then take a 9 x 5 loaf tin, line it with parchment paper and set aside. Meanwhile, combine flour, baking powder, baking soda and salt and then set aside.

Next, combine cinnamon and sugar in a smaller dish and set aside, too. Beat butter and sugar, adding eggs, yogurt and vanilla, until it is combined.

Add flour mixture , then and beat until combined, but be careful not to overbeat it.

Pour half of the batter in the 9 x 5 inch loaf tin and sprinkle with ½ of the cinnamon and sugar mixture.

Then, pour the remaining batter and cinnamon- sugar mixture on top of it and swirl with a knife. Bake it for 55-60 minutes.  

When it´s baked, leave the bread to cool in the loaf tin for a few minutes and then transfer to a wire to cool completely rack.

To make vanilla glaze you start by whisking powdered sugar, vanilla extract and milk until it becomes smooth and then drizzle vanilla glaze over the cooled bread.