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Combine butter and peanut butter in a large bowl and use an electric mixer to beat until creamy and well-combined.
Gradually (about ⅓ cup at a time), with mixer on low speed add powdered sugar until completely combined. Be sure to scrape the sides and bottom of the bowl so all ingredients are well-combined.
Stir in vanilla extract and salt.
With mixer on low-speed, add milk and stir until well-combined. Gradually increase speed to high and beat for 30 seconds.
Spread or pipe frosting onto completely cooled cupcakes or cake.