Cinnamon Bread - finally!

This is the bread from Zambia that was so loved by folks who took a long bus/car ride to and from Peteuke. It was also enjoyed by friends in Vancouver and Nairobi. Sorry it's taken me SO long to post it. The four loaves at the front at Cinnamon Bread I baked in Lusaka (the back three are banana bread).

Cinnamon Bread from Dawnya K.
2 cup flour
1 cup sugar
1 egg, beaten
1 cup buttermilk (or yogurt with a bit of milk)
¼ cup oil
1 teaspoon salt
½ teaspoon soda
----------------
1 tablespoon cinnamon
½ cup sugar

Mix all ingredients together EXCEPT cinnamon and 1/2 cup sugar.
Mix cinnamon and sugar together in separate bowl.
Pour in half the batter in a greased and floured large loaf pan then sprinkle 1/4 cup plus 2 Tablespoons of sugar/cinn. mixture over batter. Pour in rest of batter and the remaining sugar mixture.
Cut with knife for a marble effect.
Bake at 350 for 50 minutes.

 Note: I usually make a double recipe and divide it between three narrow loaf pans.  Among those three smaller pans (with two recipes of batter divided between the three)  I use less of the cinnamon sugar mixture than called for.  I put about 2 1/2 Tablespoons of cinnamon over the first half of batter and then 1 1/2 Tablespoons over the top of each loaf.   I have also decreased the amount of sugar in the recipes by about 1/4 cup sugar per recipe.