The night before, add the yeast, flour, sugar, and salt to a large bowl. Whisk together.

Then one at a time, add in the milk, butter, and vanilla -mixing to combine after each ingredient.

Cover the bowl with plastic wrap and allow to sit out at room temperature overnight.

In the morning preheat your waffle maker.

While the waffle maker heats, add the yolks of the eggs to the batter that sat out overnight. Stir to combine.

In another bowl, beat the egg whites until soft peaks form, the gently fold into the batter.

Prepare waffles according to your waffle maker's manufacturers instructions. Makes about 4-5 waffles using 1 cup of batter per waffle.