In a bowl, mix flour, cornmeal, sugar, soda, and salt. Add yogurt and eggs and mix just until blended. Pour into a buttered 8- to 9-inch square or round pan.
Bake in a 400° oven until bread springs back when gently pressed in center, 20 to 25 minutes. Cut in squares or wedges. Serve warm.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.