These old-fashioned sour cream donuts don’t require any yeast or rising time. They're soft and cakey, with a golden, crackly crust coated with creamy vanilla glaze.
Mix the dry ingredients. In a medium bowl, combine the flour, baking powder, and salt.
Mix the wet ingredients. In a separate bowl, combine the granulated sugar with the (cooled) melted butter, egg, egg yolk, and sour cream.
Combine. Add your dry ingredients to the liquid ones, then mix everything until you have a sticky dough. Do not overwork the dough, or the donuts will be tough.
Roll out the donuts. Roll the dough on a lightly floured kitchen surface using a rolling pin to ¼-inch thick. Cut out the donuts using a 2 ½-3 inch donut cutter. Gather the dough and reshape it again. Continue until you have used all the dough.
Get ready to fry them. Transfer the donuts to a sheet of parchment paper dusted with flour. If you did not make donuts with a donut cutter, make a hole in each donut with a chopstick and stretch it gently.
Fry the donuts. Heat 2 inches of oil in a pot to 375ºF. Carefully add the donuts to the hot oil. Do not overcrowd the pot. Fry the donuts for 1-2 minutes per side, then remove with a slotted spoon onto a plate lined with paper towels or a wire rack.
Make the glaze. Whisk the powdered sugar with the water in a small bowl.
Glaze the donuts. Drizzle the glaze over the donuts or dip the donuts into the glaze. Place the donuts on a wire rack until the glaze is set. Serve as desired.
Notes
Measure correctly. For best results, weigh the flour and use 270 grams. If using cups, be sure to spoon the flour into the measuring cup and level it off.
If you do not have cake flour, use all-purpose flour, but substitute ¼ cup of the flour with cornstarch.
Use full-fat ingredients. Please try to use full-fat sour cream.