Preheat oven to 325. Prepare 20 standard muffin cups with cooking spray and flour; set aside. In a mixing bowl, combine cake mix, eggs, pumpkin, water, pumpkin pie spice, and baking soda. Mix well. Pour one and half ounces of batter in each prepared cup. Bake for 25 minutes. After, baking, cool cupcakes completely. Meanwhile, prepare frosting mix according to package directions. Spread frosting over cooled cupcakes. Use any remaining frosting for another recipe.