makes 2 loaves

3 cups white whole wheat flour (or a mix of all-purpose and whole wheat)
1/2 cup stone-ground corn meal (fine grind if possible)
1 1/2 teaspoons baking soda
1/2 teaspoon baking powder
1 teaspoon salt
2 teaspoons cinnamon
1 teaspoon fresh ground white pepper
1/2 teaspoon allspice
1/2 teaspoon nutmeg
2 cups pureed squash or pumpkin
2 eggs
1/3 cup olive oil
3/4 cup agave nectar
2/3 cup yogurt
2 tablespoons sugar (optional)