Gather all your ingredients: peanut butter, powdered sugar, butter, vanilla extract, and salt.
In a medium saucepan, melt the butter over low heat.
Once melted, add the peanut butter and mix well until smooth.
Remove from heat and stir in vanilla extract and salt.
Gradually add powdered sugar, mixing until fully combined.
Line an 8x8 inch pan with parchment paper for easy removal.
Pour the mixture into the prepared pan, spreading evenly.
Refrigerate for at least 2 hours until set.
Once firm, remove from the pan and cut into squares.
Store in an airtight container in the fridge.