Line a square pan or loaf pan with parchment paper and set aside.
In a microwave-safe bowl or stovetop, combine your chocolate chips and peanut butter and heat until melted. Whisk well to ensure the mixture is fully combined.
Pour your fudge batter in the lined pan and place in the fridge or freezer until firm. Using a slightly wet knife, slice into pieces.
TO STORE: As fudge is fragile, it should always be stored in the refrigerator, in a sealed container. The fudge will keep well for up to 1 month. TO FREEZE: Place the fudge in a shallow container and store it in the freezer for up to 6 months.