Preheat oven to 350 degrees Fahrenheit. Prepare your bundt pans by spraying with baking spray.

In a medium bowl, whisk together the cake mix and cinnamon until combined. Pour in apple cider and combine well.

Bake for 20 minutes. Remove from oven and let cool.

When cooled, run a knife along the inside of the baking pans and invert them onto a cake platter to release the cakes. Combine ingredients for frosting and transfer to a pastry bag. Drizzle in a zig-zag pattern over the bundt cakes.