1. Preheat oven to 350, and grease a 9x5 loaf pan.
2. Beat butter in a large bowl, for about 1 minute. Add the 2/3 cup sugar, beat well, and add eggs, beating well. Stir in vanilla.
3. Sift together flour, baking powder, baking soda, salt, and 1 tsp cinnamon.
4.Slow mix flour mixture into wet mixture, do not overmix.
5.Mix together 2 Tbsp brown sugar and 1 tsp cinnamon in a small bowl.
6.Pour half of batter into loaf pan, sprinkle 3/4 of sugar/cinnamon mixture evenly over it. Add the rest of the batter, and sprinkle the last of the topping on top.
7.Bake 45 minutes at 350F or until done.
This is my modification of another Cinnamon Loaf Recipe. I like mine with less sugar, and with butter spread on it!