You certainly can. Simply add 1/2 teaspoon of baking soda for every 8 ounces of buttermilk. Don't change anything else. The same applies if you "make" buttermilk by adding vinegar to milk.
There are actually several substitution options for buttermilk– including a mix of cow’s milk and an acid like vinegar or lemon juice. You want the proportions to be about 1 tbsp of acid for every cup of milk, stir, and let it sit for 10-15 mins before using. Here’s an article for 7 different buttermilk substitutions for all your future baking needs:
Short answer is yes, you can replace milk with buttermilk in a baking recipe.
But it's not a 1:1 simple switch. My substitutions bible advises reducing baking powder and adding baking soda when making this replacement. Rather than making the calculations (and maybe a mistake), I would go for a waffles recipe that already has buttermilk and corn flour built in.
It is easier to replace regular flour with gf flour, 1:1, than to do the buttermilk conversion. Have a look at one of these recipes and see if they fit your meal planning.
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There are actually several substitution options for buttermilk– including a mix of cow’s milk and an acid like vinegar or lemon juice. You want the proportions to be about 1 tbsp of acid for every cup of milk, stir, and let it sit for 10-15 mins before using. Here’s an article for 7 different buttermilk substitutions for all your future baking needs:
https://food52.com/blog/25061-buttermilk-substitutes-2023
I hope this helps!
But it's not a 1:1 simple switch. My substitutions bible advises reducing baking powder and adding baking soda when making this replacement. Rather than making the calculations (and maybe a mistake), I would go for a waffles recipe that already has buttermilk and corn flour built in.
It is easier to replace regular flour with gf flour, 1:1, than to do the buttermilk conversion.
Have a look at one of these recipes and see if they fit your meal planning.
https://www.kingarthurbaking.com/recipes/crunchy-cornmeal-waffles-recipe
https://www.allrecipes.com/recipe/236853/waffle-iron-cornbread/