In a small microwave-safe bowl, heat 1 part of the divided whole milk to 110° to 115° and whisk in ½ of the sugar and brown sugar and then the yeast. Let it set for 5 minutes; it will become foamy.
In a separate large bowl, whisk together the flour and form a well. Pour the yeast mixture, the melted butter, the remaining sugars, and the other half of the milk, vanilla and egg yolks into the well and whisk. Once combined, set aside.
In a separate medium sized bowl, whisk the egg whites to soft peaks and fold them into the batter mixture until combined. Let the batter sit for 20 minutes.
Next, spray the waffle maker and pour in about ¾ cup of batter and cook.
Once the waffles are done, serve alongside the toppings as a waffle bar.