Preheat your oven to 180 C. Grease two bread pans with butter.

In a small bowl, mix together the 2/3 cup sugar and the cinnamon, set aside.

In a large bowl, cream together the butter and the 2 cups of sugar, then mix in the eggs, then mix in the flour and baking soda to make the batter.

Pour 1/4 of the batter into each bread pan, leaving half the batter in the large bowl. Now using only 3/4 of the sugar cinnamon mixture, sprinkle this onto the batter in each bread pan, use a butter knife to make some swirls in the batter.

Pour the remain batter into each bread pan and sprinkle each pan with the remaining sugar cinnamon mix, and make the swirly thing again with the knife. Bake for 45-50 minutes or until a toothpick inserted in the center comes out clean. and the top is golden brown. Remove from the oven and let cool for 20-30 minutes before turning out from the pans.