01 - Preheat the oven to 350°F. Grease and dust a 10-cup bundt pan with flour to prevent sticking.
02 - Simmer the apple cider in a saucepan over medium heat until it reduces to 3/4 cup, about 15 minutes. Set aside to cool.
03 - Whisk together flour, baking powder, baking soda, salt, cinnamon, nutmeg, allspice, and cloves in a medium bowl.
04 - Using an electric mixer, beat the butter with granulated and brown sugars until light and fluffy, approximately 3 to 4 minutes.
05 - Add eggs one at a time, beating after each addition. Mix in sour cream and vanilla extract until smooth.
06 - Add the flour mixture to the wet ingredients in three parts, alternating with the cooled reduced apple cider, beginning and ending with the flour mixture. Stir until just combined.
07 - Gently fold the finely diced apples into the batter using a spatula.
08 - Pour the batter evenly into the prepared bundt pan and smooth the surface.
09 - Bake for 45 to 55 minutes or until a toothpick inserted in the center comes out clean.
10 - Allow the cake to cool in the pan for 15 minutes, then invert onto a wire rack to cool completely.
11 - Whisk powdered sugar with 2 to 3 tablespoons of apple cider until smooth and pourable; drizzle over cooled cake before serving.