- Grease two 9x5 loaf pans. Set aside until needed. 
- Cream together butter, 2 cups sugar, and eggs. Add milk, flour, and baking soda. Mix well. 
- Put 1/4 of batter in each greased loaf pan. 
- Mix the 2/3 cup sugar and cinnamon in separate bowl. 
- Sprinkle 3/4 of the cinnamon mixture on top of the batter in each pan. Add remaining batter to pans; sprinkle the remaining cinnamon topping. Swirl with a knife. 
- Bake at 350 degrees in a preheated oven for 45-50 minutes or until tester comes clean. [I had to bake them for 65 minutes before they were finished.] 
- Cool in pan for 20 minutes before removing from pan.