First, start by spraying the donut pan with cooking spray and then preheat the oven to 350 F.
Next, take a large bowl, put the eggs, sugar, pumpkin, vegetable oil, baking powder, cinnamon and milk in it and beat until they are well combined. When done, add in the all-purpose flour and stir again.
Be careful not to overfill the donut pans, try to fill ¾ of the wells and let them bake for 15 minutes.
Once done, get the pan out of the oven and leave it to cool off for at least 5 minutes and remove the donuts after.
In one bowl melt the butter and use another bowl to combine the cinnamon and sugar in.
Spread the butter with a pastry brush over the donuts and then dip them into the cinnamon sugar.
Leave the donuts to cool off, then serve and enjoy.