Prepare Your Pan: Line an 8x8-inch square pan with parchment paper, allowing for some overhang on the edges.

Melt the Chocolate Mixture: Combine semi-sweet chocolate chips and sweetened condensed milk over low heat, stirring for about 5 minutes until smooth and glossy.

Spread the Fudge Base: Pour the melted chocolate mixture into your prepared pan and spread evenly to form the base.

Prepare the Raspberry Swirl: Warm raspberry jam in the microwave for about 10-15 seconds to make it pourable, then drizzle over the fudge base.

Create the Spooky Swirl: Use a knife or skewer to gently swirl the raspberry jam into the chocolate fudge for a marbled effect.

Chill to Set: Place the pan in the refrigerator and chill for at least 2 hours until firm to the touch.

Slice and Serve: Lift the fudge out of the pan using the parchment overhang and slice into 1-inch pieces.