Peanut Butter Frosting

 1 cup butter

1/2 c creamy peanut butter

1 tsp vanilla extract 

1 pinch salt 

4 c confectioners sugar 

1/4 c milk, or more if needed 

Beat butter in a bowl using an electric mixer until fluffy. Add peanut butter, vanilla, and salt; beat until smooth. Slowly pour confectioners sugar into peanut butter mixture while continuing to beat with the mixer; add milk until desired thickness is reached.