Light Lemon Blueberry Donuts

Ingredients

• 1/2 cup white whole wheat flour
• 1/2 cup all-purpose flour
• 1/3 cup granulated sugar
• 3/4 teaspoon baking powder
• 3/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1 egg
• 1/2 cup plain low-fat yogurt
• 1 tablespoon canola oil
• zest of one lemon, plus 1 tablespoon lemon juice
• 1 1/2 cups fresh blueberries
• 1 tablespoon plus one teaspoon granulated sugar
• zest of one lemon, chopped