Blueberry Maple Tea Cake
from Cookie + Kate

¼ cup powdered sugar

Pinch sea salt or kosher salt

3 tablespoons real maple syrup

3 tablespoons unsalted butter

1 cup fresh blueberries

6 tablespoons (¾ stick) unsalted butter, melted

½ cup milk

1 large egg, lightly beaten

⅔ cup real maple syrup (preferably Grade B)

⅛ teaspoon ground cinnamon

¼ teaspoon kosher salt

¼ teaspoon baking soda

1½ teaspoons baking powder

¾ cup whole wheat flour

¾ cup plus 2 tablespoons whole wheat pastry flour or whole wheat flour