Preheat the oven to 350 degrees. As the oven preheats, prepare your loaf pan by spraying it with non-stick cooking spray and lining the bottom with parchment paper.
In a small saucepan, bring the apple cider to a boil. Allow it to simmer for approximately 8 minutes, or until the liquid reduces to 1/2 cup.
Once the cider has reduced, let it cool slightly in a small bowl. Mix in the sour cream and vanilla extract. In the same saucepan, melt the butter.
Using a stand mixer or hand mixer, beat together the eggs and brown sugar until the mixture is smooth and slightly frothy.
With the mixer on low speed, gradually add the melted butter to the egg mixture, blending thoroughly.
In a medium bowl, combine the flour, cornstarch, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger. For a simplified spice blend, you may substitute apple pie spice.
With the mixer set to low, add a little of the the dry ingredients into the egg mixture, alternating with the cider and sour cream mixture. Begin and end with the dry ingredients. Mix until just combined—be cautious not to overmix, as this can affect the texture of your bread.
Pour the batter into the prepared loaf pan. Bake for 55-60 minutes, or until the bread is golden brown and a knife or toothpick inserted into the center comes out clean.
Allow the loaf to cool for 10 minutes on a wire rack. For the cinnamon sugar coating, combine 1/4 cup of sugar with 1 teaspoon of cinnamon. Brush the warm loaf generously with melted butter, then coat with the cinnamon sugar mixture.
Enjoy!