Preheat oven to 325 degrees. Spray a loaf pan with nonstick cooking spray and set aside.
In a large bowl, whisk together: flour, baking soda, salt, baking powder, and granulated sugar. Create a well in the middle of the ingredients and pour in the wet ingredients: maple syrup, oil, apple sauce, eggs, extracts, and lemon zest. Stir the center of wet ingredients first before starting to incorporate the wet into the dry. Stir until dry ingredients are just combined. Add in poppyseed and stir again gently.
Pour into prepared loaf pan and bake 50 minutes to 1 hour, or until a toothpick comes out clean. Cool 15 minutes in the pan before removing to a cooling rack. Cool completely.
For the glaze, stir powdered sugar together with just enough lemon juice to create a thick glaze the consistency of white school glue. Drizzle generously over loaf and enjoy!