Mix together 1 1/4 cups unbleached flour, 3/4 cup cornmeal, 3 teaspoon baking powder, 1/2 teaspoon salt, and 1/4 cup sugar. In separate bowl, add 1/2 teaspoon baking soda to 1 cup sour cream and stir until frothy. Add 1 beaten egg to sour cream mixture and mix. Add sour cream mixture slowly to dry ingredients and stir until just mixed good. Fill 12 greased muffin pans about 2/3 full. Bake in preheated 350 degree oven about 25 minutes or until nicely brown.