01 - Preheat oven to 350°F (175°C). Grease a standard 12-cup muffin tin thoroughly with butter or nonstick spray.
02 - In a large mixing bowl, combine all-purpose flour, granulated sugar, baking powder, salt, ground cinnamon, and ground nutmeg. Whisk until the mixture is evenly blended.
03 - In a separate bowl, whisk together the melted butter, reduced apple cider, and large egg until fully incorporated.
04 - Pour the wet ingredients into the bowl with the dry mixture. Stir gently until just combined, being careful not to overmix to maintain a tender crumb.
05 - Evenly spoon the batter into the prepared muffin tin, filling each cavity three-quarters of the way. Bake for 18 to 20 minutes, or until a toothpick inserted into the center emerges clean.
06 - While muffins are still warm, dip each one into melted butter and then roll generously in the cinnamon-sugar mixture to achieve a uniform coating.