Mix together the warm water and yeast in a very large bowl, let stand for 5 minutes until foamy
Combine the butter and milk, add to the yeast mixture.
Add in the flour, sugar and salt and stir until a batter forms.
Cover the dough with plastic wrap; let it sit on the counter for one hour. After the hour is up, put the bowl in the fridge overnight (or for 8-10 hours)
The next morning, mix the eggs, baking soda and vanilla into the batter.
Cook the waffles according to you instructions on your waffle iron. I used about 1/2 cup batter per waffle and mine cooked in about 5 minutes.
Little Helpers: My girls love to watch the yeast in action and stir in all the ingredients. Even my 20 month old got in on the action this time!Freeze It: You can freeze any leftover waffles. Thaw them in the microwave and then put them in the toaster to crisp up.