In a copper mug or other short cocktail glass, add fresh lime, apple cider, whiskey and pie spice.
Add ice then top with 2-3 oz. of ginger beer.
Top with an apple slice dusted with pie spice.
Do not use more than 2-3 oz. of ginger beer as it will overpower the other flavors. If you want to add more liquid to fill your mug, add more apple juice. For more pronounced apple flavor you can look for a cold-pressed apple juice in the refrigerated juice section. Don't want to use maple syrup? You can substitute simple syrup, honey or a flavored simple syrup like this Vanilla Simple Syrup with Cinnamon.