Dissolve yeast in warm water in a mixer bowl.

Add milk, beaten egg, vanilla, melted butter, sugar, and salt to the yeast mixture.

Beat in flour, one cup at a time, on medium-high speed for 1 minute.

The dough will be sticky.

Work with 1/4 of the dough at a time.

Place dough on a well-floured surface and roll to 1/8 inch thickness.

Cut dough into 2-inch squares.

Preheat oil to 370 degrees Fahrenheit.

Fry dough squares in oil, a few at a time.

Flip squares when they rise to the surface and cook until golden brown.

Drain on paper towels.

Dust with confectioners' sugar or cinnamon sugar.

Serve warm.