Whisk the sugar, cinnamon, and nutmeg together in a medium bowl. Set aside
Using a stand mixer with the paddle attachment (or a hand mixer) beat the butter and cream cheese together. About 1 minute.
Reduce the speed to low and slowly add the sugar mixture. Beat for about 3 minutes. Stop and scrap down the sides of the bowl with a rubber spatula. Add the pumpkin puree and beat for 1 minute on medium speed.
Spread and serve. Refrigerate.
Recipe by Mamal Diane at https://mamaldiane.com/pumpkin-cream-cheese-frosting/