In a large bowl, combine all the dry ingredients and mix well. Then mix in the milk, butter and vanilla (or lemon juice). Cover and leave overnight at room temperature.
The next morning, stir in the egg yolks.
Beat the egg whites in a separate bowl until soft peaks form, then gently fold into the waffle mixture.
Oil the waffle maker if needed, and preheat.
Pour batter into waffle maker and cook until done, about 3-5 minutes. Ta dah! Overnight waffles are ready. Serve immediately or keep warm in the oven.
Notes
Serve with Buttery Maple Nectarine Topping (recipe card below)
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