In the large bowl of an electric stand mixer or with a handheld electric mixer, whip butter on medium speed for 1 - 2 minutes. (thecomfortofcooking.com)
In a large bowl of an electric stand mixer, with the paddle attachment, mix the butter and sugar until light and fluffy, about 2 - 3 minutes. (sweetbakedlife.com)
Place pumpkin puree, vegetable oil, eggs and sugar in a mixing bowl of an electric stand mixer. (piarecipes.com)