Preheat oven to 180C and prepare 2 loaf pans.

In a small bowl mix most of the cinnamon and 6 tablespoons of sugar together and set aside.

In another bowl mix together flour, baking powder, salt and 1 teaspoon cinnamon and set aside.

In your electric mixer (or a large bowl), cream the butter, sugar and oil on medium speed for about 1 minute.

Add the eggs and mix.

Add the vanilla and yogurt and mix until just combined.

Add in the flour mixture and stir by hand until just combined.

Scoop a 6th of the batter into each loaf tin, sprinkle a thick layer of cinnamon sugar over the batter, repeat 2 more times, ending with a cinnamon sugar layer.

Bake for about 40-45 minutes.

Remove from oven and allow to cool before removing from the tins.

Serve warm with a little butter spread on.