Combine all of the spices in a small bowl, and set aside. Combine the topping ingredients, and set aside.
Preheat the oven to 350 degrees Fahrenheit, and line a cupcake pan with liners.
Make your “buttermilk” by combining the oat milk and apple cider vinegar in a small bowl. Stir, set aside, and let sit for 5 minutes.
In a stand mixer, add in the sugar, and oil. Using a paddle attachment, blend well. In another medium bowl, sift the flour, baking soda and salt together.
Once the buttermilk has been left to sit for at least 5 minutes.
Add pumpkin and milk mixture to the stand mixer that has the oil and sugar. Mix to combine well. The mixture will be pretty watery, and that's okay. Add in half the flour, mixing until combined. Scrape the bowl down, add in the last half, and mix well again. Using a 1/4 cup scoop, fill each cupcake liner to about half full. Top each with 1 heaping tablespoon of topping, spreading evenly.
Bake in the oven for 20 – 24 minutes, or until a toothpick inserted in the center comes out clean. Resist the urge to open the oven door, as this may cause them to sink.
When the cupcakes are done, remove them from the pan, and set on a wire rack to cool for at least 15 minutes before serving. Enjoy!