01 - Line an 8-inch square baking pan with parchment paper, leaving an overhang on the sides for easy removal.
02 - In a medium saucepan over low heat, combine chocolate chips, sweetened condensed milk, and 2 tbsp butter. Stir constantly until melted and smooth. Remove from heat and stir in 1 tsp vanilla extract.
03 - Pour the chocolate mixture into the prepared pan and spread evenly into a smooth layer.
04 - In a separate bowl, mix together creamy peanut butter, powdered sugar, melted butter, salt, and 1 tsp vanilla extract until the mixture is smooth and creamy.
05 - Gently spread the peanut butter mixture over the chocolate layer. Use a spatula to smooth the top without disturbing the chocolate underneath.
06 - Refrigerate for at least 2 hours, or until the fudge is completely firm.
07 - Remove the fudge from the pan using the parchment paper overhang. Cut into 36 small squares using a sharp knife.
08 - Store in an airtight container in the refrigerator for up to 1 week.