Preheat your oven to 350°F (177°C) with an oven rack set in the center position. Line a standard 12-cup muffin tin with paper cupcake liners.
In a medium bowl, whisk together the all-purpose flour, baking powder, baking soda, 1 teaspoon ground cinnamon, ground nutmeg, ground allspice, and fine sea salt until thoroughly combined. Set aside.
In a large mixing bowl, whisk together the granulated sugar, packed brown sugar, room-temperature eggs, vegetable oil, vanilla extract, and sour cream until smooth, glossy, and fully emulsified (about 1 minute). Whisk in the cooled 1/2 cup reduced apple cider.
Pour the dry ingredients into the wet mixture. Fold gently with a rubber spatula just until no flour pockets remain. Divide the batter evenly among the 12 cupcake liners, filling each roughly two-thirds full.
Bake at 350°F (177°C) for 17 to 20 minutes, until the tops spring back when lightly touched and a toothpick inserted in the center comes out clean or with moist crumbs. Cool in the tin for 5 minutes, then transfer to a wire rack to cool completely before frosting.