Heat oven to 200F.
Preheat waffle iron. Set at 4 minutes (up to 5 1/2 with blueberries)
Whisk: Flour, salt, buttermilk, and baking soda.
Whisk: yogurt, sugar, eggs, vanilla, and oil then blend in seltzer
Add wets to dries and mix
Place waffles on bare rack in oven
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