Mix buttermilk and soda and let stand 15 minutes. Mix butter, sugar, egg and flour together until smooth. Mix 1/2 c. sugar with 1 Tbsp. cinnamon. Place batter in layers in loaf pan. Top each layer with sugar and cinnamon mixture. Run knife through mixture length three times, top with remaining sugar and cinnamon. Bake at 350º for 40-50 minutes.
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