Line an 8×8-inch baking dish with parchment paper.
Melt white chocolate chips with condensed milk over low heat. Stir in vanilla and strawberry gelatin powder. Add food coloring for a bloodier look.
Spread the strawberry mixture into the prepared pan.
In another bowl, melt dark chocolate chips with butter until glossy.
Drizzle melted chocolate over the strawberry fudge and swirl gently with a skewer.
Refrigerate for 2 hours until firm. Cut into squares and serve.
