I usually use salted butter in my butter cream but my local grocery store had a really good sale on unsalted butter so I decided to stock up. Does anyone know about how much salt I should add to my frosting since the butter in unsalted? My recipe uses 2 lbs powdered sugar, 1 1/2 cups hi ratio shortening, 1/2 cup salted butter, 2 tablespoons clear vanilla and 1/3 cup water. Thank you.

AIIRC Cooks Illustrated touts 1/4 t per 4oz of butter, for the conversion. But brands do vary......

Thank you

I use a full teaspoon of popcorn salt and my recipe uses 1.5-2 lbs powdered sugar too.

My BC recipe uses 2 lbs of butter, 4 lbs of powdered sugar, (no shortening) and I add a 1/2 tsp of salt to my batch.

I never use salted butter because salted butter tends to be "less fresh" (the salt is a preservative) and there's little regulation in the amount of salt added by each manufacturer - even batches by the same manufacturer can have different amounts.  Some people swear by it though!