Preheat your oven to 350°F. Line two baking sheets with parchment paper.
In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, and salt. Set aside.
In a large bowl, beat the softened butter, brown sugar, and granulated sugar together until light and fluffy, about 3-4 minutes.
Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract and apple cider.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Using a cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.
Bake for 12-15 minutes, or until the edges are lightly golden. Remove from the oven and let cool on the baking sheets for 5 minutes before transferring to wire racks to cool completely.
While the cookies cool, prepare the filling. In a medium bowl, beat the softened butter until creamy. Gradually add the powdered sugar, mixing until well combined. Stir in the vanilla extract and add heavy cream as needed to achieve a smooth consistency.
Once the cookies are completely cool, spread a generous amount of filling on the flat side of one cookie and top it with another cookie to create a sandwich.
Serve immediately or store in an airtight container for up to 3 days.