Pour 1 1/2 cups Apple Cider into a small saucepan over medium high heat. Bring to a boil and boil until there's only 1/2 cup (120g) left - this will take about 25-30 minutes. Once reduced, pour into a large mixing bowl. Add 1/2 cup Apple Butter, additional 1/4 cup Apple Cider (not reduced), 1 cup Sugar , and 1/2 cup + 2 tbsp Vegetable Oil. Whisk together for about 1 minute, until the sugar begins to dissolve. Let it cool for about 5 minutes.
Preheat the oven to 350 degrees F.
Add 2 large Eggs and 1 1/2 tsp Vanilla Extract and continue to whisk together until smooth, about 30 seconds. Then add the dry ingredients, 2 1/4 cups All Purpose Flour , 2 tsp Baking Powder, 2 tsp Cinnamon, 1/2 tsp Nutmeg, and 1/2 tsp Kosher Salt . Mix until combined and smooth, about 30-40 seconds.
Line a 8.5x4.5 inch loaf pan with parchment paper so that there's about 2 inches of overhang on each side. Pour the batter into the pan and bake for 55-60 minutes, until a wooden skewer inserted into the center of the loaf comes out with just a few crumbs.
Let the loaf cool for about 20 minutes in the pan, then remove and brush the tops and sides of the loaf with 2 tbsp Salted Butter (melted). Combine 1/4 cup Sugar and 2 tsp Cinnamon in a small bowl. Sprinkle evenly with the loaf with the cinnamon sugar mixture.
In a medium bowl, whisk together 1 cup Powdered Sugar, 1 tbsp Apple Cider, and 2 tbsp Heavy Cream until smooth. Drizzle on top of the loaf and serve.