Step 1

Combine yeast and water in a mixer, let stand for 10 minutes.

Step 2

Add sugar, salt, butter, egg, egg yolk, vanilla, and flour to the yeast mixture. Knead until a soft dough forms.

Step 3

Transfer the dough to a bowl, cover, and let rise for 2 hours.

Step 4

Refrigerate the dough overnight.

Step 5

Roll out the dough, cut out doughnuts, and let them rest for 1 hour.

Step 6

Heat vegetable shortening and fry the doughnuts until golden brown.

Step 7

Make the glaze by whisking together powdered sugar, water, and vanilla.

Step 8

Dip each doughnut into the glaze and allow to set.