I start by beating the softened butter and sugar together until the mixture turns pale and fluffy, which usually takes about three to five minutes. This step matters more than people think, since it traps air that keeps your cookies from turning dense. I scrape the bowl once halfway through so nothing sits unmixed at the bottom.
Next, I mix in the boiled cider, followed by the egg and vanilla. I beat just until everything looks smooth and combined, then stop the mixer and scrape the sides again. This is where the batter starts smelling like fall, and I always sneak a little taste of the dough here.
I whisk the flour, apple pie spice, baking powder, and salt together separately first, then add it to the wet mixture. I mix on low just until the dough comes together and I don't see any dry streaks of flour left in the bowl.
I transfer the dough into a bowl, cover it, and pop it in the fridge for at least four hours, though overnight works even better. This step firms up the butter so the cookies hold their shape and don't spread into flat puddles in the oven.
Once the dough is chilled, I preheat my oven to 375°F and set my racks in the upper and lower thirds. I scoop the dough into two-tablespoon balls, then roll each one in the cinnamon-sugar coating until it's fully covered on all sides.
I space the cookies at least two inches apart on my lined baking sheets and sprinkle any leftover coating on top. They bake for 12 to 15 minutes, and I swap the pans' positions halfway through so everything browns evenly.
Once they're out of the oven, I let the cookies cool completely right on the baking sheet. They finish setting up as they cool, so the centers stay soft while the edges stay slightly crisp.