Spray a 9-inch square pan with non-stick spray containing flour. Mix soda into yogurt, allowing space for foaming. Cream margarine. Add 1 c sugar, then egg whites & vanilla. Sift flour & baking powder together. Add alternately with yogurt mixture. Mix remaining 1/2 c sugar & cinnamon. Pour one-fourth batter into pan, then sprinkle with one-fourth cinnamon sugar mixture. Continue in this maruler until all batter & cinnamon-sugar is used. Bake at 350 for 30 -35 minutes.
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