Add 1 stick of salted real butter, 1 stick of unsalted real butter, 1 cup of shortening (not oil).
Mix then add 1 teaspoon of vanilla.
Add a 2 pound bag of powdered sugar.
Add 5-6 Tbsp of water (adding 1 T at a time). It will get really stiff so then you add just a little bit of water at a time to get the texture you want.
Recipe by The Coupon Challenge at https://www.thecouponchallenge.com/how-to-make-buttercream-frosting.html