01 -
Mix yeast, warm water, and 1 tablespoon sugar. Let stand 5-10 minutes until foamy.
02 -
Combine dry ingredients separately. Add shortening, egg yolks, and vanilla to yeast mixture. Gradually mix in flour mixture and knead for 2 minutes until smooth.
03 -
Place dough in greased bowl, cover, and let rise in warm, steamy oven for 1 hour until doubled.
04 -
Roll dough ½-inch thick and cut with 2½-inch biscuit cutter. Place on prepared sheets.
05 -
Let donuts rise again in warm oven for 45 minutes until doubled.
06 -
Heat oil to 360-370°F. Fry donuts 30-45 seconds per side until golden. Roll in sugar while warm.
07 -
Make hole in side of each donut with toothpick. Pipe warm Nutella into center until plump. Optional: top with extra Nutella.