This old fashioned cake donut is a yummy chocolate treat topped with a simple and old fashioned glaze.
Whisk together flour, cocoa powder, baking powder, salt and nutmeg. Set aside.
Beat together sugar and butter until combined. Beat in egg yolks until mixture has thickened. Mix in flour mixture and sour cream until well incorporated. Place dough in a bowl and chill overnight in the fridge.
Heat oil to 325F.
On a floured table roll out chilled dough so that its about 1/2 an inch thick (use flour to help roll out). Cut shaped out of dough, until dough is all used up.
Fry donuts in heated oil. Fry each side for about a minute and a half, crack should form. Transfer to a plate with paper towel to drain off excess oil.
Whisk together sugar, salt, vanilla and milk until smooth.
Pour glaze over warm donuts. Serve.