Preheat an oven to 350 degrees F.
Add cake mix, pumpkin puree, and ginger ale to a large mixing bowl. Add 1/2 tsp pumpkin pie spice and 1 tsp ground cinnamon and whisk until well combined.
Evenly coat a bundt cake pan with cooking oil spray. Use a rubber spatula to scrape the batter from the bowl into the pan and spread evenly. Bake for 33–36 minutes. Remove from the Oven and set aside to cool for 20 minutes.
While the cake is cooling, add confectioner’s sugar and remaining pumpkin pie spice and cinnamon to a mixing bowl and mix until well combined.
To remove the cake from at pan, use a butter knife and gently scrape down to release any cake that may be sticking to the edges or center of the pan. Place a plate top-side-down over the pan. Place one hand firmly in the center of the plate and use the other hand to flip the cake pan upside down. After allowing the pan to sit on top of the plate for a few moments, remove the pan – this time ensures that gravity aids in releasing the cake fully from the pan.
Add the confectioner’s sugar mix to a sifter and dust evenly over the top of the cake. Slice and serve.