-
Combine yogurt with baking soda. Mix well and set aside. (Note, the mixture will increase in volume).
-
In a separate bowl, beat the margarine with the brown sugar until well-mixed. Add the eggs and vanilla and beat well for around 2 minutes.
-
Stir together the flours and the baking powder. Add to the margarine-brown sugar mixture alternately with the yogurt mixture.
-
Spread half the batter into the non-stick bundt pan or one sprayed with non-stick spray.
-
Mix together the brown sugar and cinnamon for the topping mixture and sprinkle half of it on top of the batter in the pan.
-
Cover with the remaining batter and sprinkle with the remaining topping.
-
Bake at 350 degrees for 45 minutes or until cake tester comes out clean.
-
Let cool for 20-25 minutes in pan, then invert and cut into 12 servings.