01 -
Line an 8×8 inch baking pan with parchment paper and set aside.
02 -
In a large bowl, beat creamy peanut butter and softened butter together with an electric hand mixer until smooth.
03 -
Gradually add powdered sugar while mixing, then add vanilla extract and salt; mix until fully combined and the mixture is slightly crumbly.
04 -
Transfer and press the peanut butter mixture evenly into the prepared pan.
05 -
Combine chopped semi-sweet chocolate and butter in a microwave-safe bowl; melt in 30-second intervals, stirring after each until smooth.
06 -
Pour melted chocolate mixture over the peanut butter layer and gently spread evenly with an offset spatula.
07 -
Refrigerate bars for 10 to 20 minutes or until chocolate is firm but not frozen.
08 -
Using a sharp knife warmed in hot water and dried, cut bars into 16 pieces and serve.