Gather 1 cup peanut butter, 1/2 cup butter, 1 teaspoon vanilla, 3 1/2 cups powdered sugar, and a pinch of salt
Line an 8×8-inch pan with parchment paper
Melt the butter in a saucepan over low heat
Stir in the peanut butter until smooth
Remove from heat
Mix in the vanilla and salt
Add the powdered sugar gradually, stirring until fully combined
Press the mixture into the prepared pan
Smooth the top with a spatula
Chill until firm
Cut into squares and serve