1 pound Earthbound Farm Organic Garnet or Jewel Yams (sweet potatoes, peeled and cubed)
1/2 cup sour cream
1 large egg
1/2 cup unsalted butter (melted)
1/4 cup milk
1 1/2 cups unbleached all-purpose flour
1 cup (packed) brown sugar
2 teaspoons baking powder
1 teaspoon baking soda
1 tablespoon pumpkin pie spice
1/4 teaspoon salt
3/4 cup fresh or frozen cranberries (coarsely chopped)