Pour the apple cider into a small saucepan and bring to a simmer over medium heat. Adjust the heat as needed to maintain a steady simmer and cook until the cider has reduced to 45 grams (3 tablespoons). Weigh the cider periodically as it becomes more concentrated, since the reduction will happen more quickly near the end. Transfer to a small bowl and cool completely.
2 cups (480 g) fresh apple cider
Combine the light brown sugar and cinnamon for the cinnamon sugar ribbon in a small bowl. Set aside.
⅓ cup (67 g) packed light brown sugar, 2¼ tsps (6 g) ground cinnamon
Combine the light brown sugar, flour, cinnamon, and salt for the streusel in a medium bowl. Add the melted butter and vanilla extract and stir with a fork until evenly moistened and crumbs form. Press some of the mixture together with your fingers to form larger pieces. Set aside.
⅓ cup (67 g) packed light brown sugar, ½ cup (65 g) all-purpose flour, ½ tsp (1 g) ground cinnamon, ¼ tsp (1 g) kosher salt, 4 tbsps (56 g) unsalted butter, 1 tsp (5 ml) vanilla extract
Line a standard 12-cup muffin pan with paper liners.
Whisk together the flour, baking powder, baking soda, salt, cinnamon, nutmeg, allspice, and cloves in a medium bowl.
3 cups (375 g) all-purpose flour, 2½ tsps (10 g) baking powder, ½ tsp (2 g) baking soda, 1 tsp (3g) kosher salt, 2 tsps (5 g) ground cinnamon, ½ tsp (1 g) freshly grated nutmeg, ⅛ tsp (0.25 g) ground allspice, ⅛ tsp (0.25 g) ground cloves
Whisk the eggs and granulated sugar in a large bowl until thoroughly combined and slightly pale. Add the buttermilk, 45 grams (3 tablespoons) cooled apple cider reduction, neutral oil, melted butter, and vanilla extract. Whisk until smooth and thoroughly combined.
2 large eggs, 1 cup (200 g) granulated sugar, ¾ cup (180 ml) plus 1 tbsp (15 ml) buttermilk, 3 tbsps (45 g) cooled apple cider reduction, ¼ cup (60 ml) neutral oil, ¼ cup (60 g) unsalted butter, 1½ tsps (7.5 ml) vanilla extract
Add the dry ingredients to the wet ingredients and fold with a rubber spatula until no dry flour remains. Do not overmix.
Cover the batter and let it rest for 15 minutes. While the batter rests, preheat the oven to 425°F (218°C).
Divide approximately 40% of the muffin batter evenly among the 12 prepared muffin cups.
Sprinkle 1 teaspoon of the cinnamon sugar mixture evenly over the batter in each muffin cup. Using the bowl of the teaspoon, make a well in the center of the batter, then add another teaspoon of cinnamon sugar to each well.
Divide the remaining muffin batter evenly among the muffin cups, covering the cinnamon sugar ribbon.
Break the streusel into large crumbs with a fork. Cover each muffin with approximately 1 tablespoon of streusel, lightly pressing the crumbs into the batter to help them adhere.
Bake at 425°F (218°C) for 5 minutes. Without opening the oven door, reduce the temperature to 350°F (177°C) and continue baking for 10–12 minutes, until the muffins are golden and the center of each muffin reaches 195–200°F (91–93°C).
Cool the muffins in the pan for 10 minutes, then transfer them to a wire rack to cool completely.