Ingredients
Pastry:

1 cup/250 mL sour cream
1 tsp/5 mL baking soda
1/2 tsp/2.5 mL salt
1/2 cup/125 mL (1 stick) butter
1 cup/250 mL sugar
2 eggs
1 tsp/5 mL Watkins Baking (Original Double-Strength) Vanilla
1-3/4 cup/325 mL flour
1 tsp/5 mL baking powder

Filling:

1/2 cup/125 mL brown sugar
1-1/2 tsp/7.5 mL Watkins Purest Ground Cinnamon
Directions
Combine sour cream and baking soda in small bowl; allow to work while mixing rest of loaf. Cream together butter and sugar. Add eggs and vanilla. Combine dry ingredients and mix alternately with sour cream into batter mixture. In a separate bowl, mix cinnamon and brown sugar filling. In a greased loaf pan, alternate a third of the batter mixture with a third of the filling; repeat. Swirl with knife. Bake at 350ºF/ 180ºC for 1 to 1-1/2 hours.