2 c All purpose/unbleached flour
1 1/2 c sugar
2 t baking powder
1/2 t soda
1/2 t salt
1 1/3 c dairy sour cream
2/3 c butter/margarine, softened
1 t vanilla
3 eggs
1/2 c sugar
1 t cinnamon
6 oz. semi-sweet chocolate chips
Heat oven to 350 degrees F (325 if glass pan) grease 13x9 in. pan. In large bowl, combine first 9 ingredients. Blend 1 min at low speet; 3 min at med. speed. pour half of batter ( approx. 2 1/2c) into greased pan. In small bowl, combine 1/2 cup of sugar mixture and cinnamon. Sprinkle half of sugar mixture and choc. pieces over batter. Bake 35-40 min or until toothpick inserted in middle comes out clean.
Above 3500 feet: decrease baking powder to 1 tsp. Bake at 375 degrees F (350 for glass pan) for 30 to 35 min