Preheat your oven to 350°F (175°C) and grease a 12-cup bundt pan with unsalted butter or non-stick spray.

In a large mixing bowl, combine flour, baking powder, salt, cinnamon, and nutmeg. Whisk thoroughly for about 1 minute.

In a stand mixer, beat together butter, brown sugar, and granulated sugar for 3-5 minutes until light and fluffy. Add eggs one at a time.

Gradually incorporate the dry ingredients into the butter mixture while mixing on low speed, then slowly pour in apple cider until combined.

Pour the batter into the bundt pan and bake for 40-50 minutes until a toothpick comes out clean.

Prepare the glaze by reducing apple cider in a saucepan over medium heat until thickened, then whisk in butter and sugar.

Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack and brushing with warm cider glaze.

Sprinkle cinnamon sugar on top before serving.