Do you want a less sweet buttercream frosting? If you do, you should know that, in general, buttercream frosting is a mixture of butter and powdered sugar.
To tone down your sweet American buttercream, add lemon juice; keep in mind that the sourness of the lemon will cut through the sugar in your frosting.
You can use heavy cream to soften your frosting and make sure to beat it well. The addition of heavy cream will help dilute the final sugar ratio in your frosting.
Essentially, adding extra salt can also cut the sweetness in your frosting; avoid adding too much, or your frosting will become salty. Remember, add enough to balance the sugar.
For the most part, adding salt to your frosting is a simple trick to balance the amount of sugar without over-altering your frosting recipe; keep in mind that your frosting will still taste sweet.
Find out more tips and tricks in the link below.