Preheat the oven to 400°F. Line a muffin tin with parchment paper liners (recommended) Or line with paper liners and lightly grease/spray inside of liners- this will ensure that they peel off the muffins easily.
Combine 3/4 cup reduced apple cider and buttermilk in a small bowl; set aside.
In a medium-sized mixing bowl, cream together the butter and sugars till smooth.
Add the eggs and beat until combined and fluffy
Stir in the baking powder, baking soda, nutmeg, salt, and vanilla.
Stir the flour into the butter mixture alternately with the buttermilk/cider mixture, beginning and ending with the flour and making sure everything is thoroughly combined. Spoon the batter evenly into the prepared pan, filling the cups nearly full.
Bake the muffins for 15 to 17 minutes, or until they're a pale golden brown and a toothpick inserted into the middle of one of the center muffins comes out clean. Allow to cool in pan several minutes, until just cool enough to handle- you want to dip them while warm.