Directions for doughnuts: Grease or spray doughnut pan. Preheat oven to 400℉. Pour doughnut mix into a bowl. Add milk, egg and ⅓ cup melted butter. Beat on medium speed about 30 seconds to combine. Pipe or spoon batter into doughnut pan, filling each well half full. Bake 9-10 minutes, or until lightly browned.
Directions for topping: Pour topping mix into a small bowl. Melt butter in a small saucepan and cool. Remove doughnuts from pan while still warm. Gently brush each with melted butter and then roll in cinnamon sugar mixture. Serve immediately.
Yield may vary based on style and brand of doughnut pan.