Modified from Cooking for 2
2/3 cup butter, softened
2/3 cup plus 1 tbsp sugar, divided
1 egg
1/2 tsp vanilla
1 1/2 cups flour
1/2 tsp baking soda
1/2 tsp salt
1/2 tsp ground nutmeg
1/2 tsp ground cinnamon, divided
1/2 cup sour cream
In a large mixing bowl, cream butter and 2/3 cup sugar. Add egg and vanilla; mix well. Combine the flour, baking soda, salt, nutmeg and 1/2 tsp cinnamon; add to creamed mixture alternatively with sour cream.
Pour into bread pan (this originally used two mini loaf pans, which I don't have and didn't want to buy, so I just used my smallest loaf pan and it worked out) coated with cooking spray. Combine remaining sugar and cinnamon and sprinkle over the top. Bake at 350 for 40-45 minutes (doing one, this took about 50 minutes) or until a toothpick inserted near center comes out clean.
Cool for 10 minutes in pan before removing to wire rack to finish cooling.