LEMON YOGURT SNACK CAKE

saw this in a magazine...
1 1/2 c. flour
3 Tbsp. cornmeal
1 tsp.baking powder
1/4 tsp baking soda
1/2 tsp. salt
2 tsp poppy seeds
3/4 c. sugar
1 Tbsp grated lemon zest
1/4 c. fresh lemon juice
3/4 c. plain low-fat yogurt
1/3 c. vegetable oil
1 large egg
1/2 tsp.vanilla extract
bake @ 350 degrees