From Sarah Lipoff, POPSUGAR Food
Preheat your oven to 350ºF.
In a medium mixing bowl, pulse together the butter and cupcake mix with a hand mixer until it resembles coarse cornmeal.
Slowly add the eggs and milk, whipping the mixture until all ingredients are incorporated. The batter will be a bit grainy, but that's just all the yummy vanilla bits.
Add the sprinkles and gently stir. Pour the batter into a greased doughnut pan and bake for 12-15 minutes.
Remove doughnuts and let cool completely before the next step.
Mix together the powdered sugar and milk in a shallow bowl. Dip the tops of the doughnuts in the mixture and then place on a baking tray. Top with more sprinkles and enjoy!