01 -
Line an 8x8 inch straight-sided baking pan with parchment paper, leaving an overhang on the sides to easily lift out the fudge after setting.
02 -
Combine white chocolate chips, sweetened condensed milk, and cold cubed unsalted butter in a medium saucepan over medium-low heat. Stir continuously for 4 to 6 minutes until the mixture is fully melted and smooth. Remove from heat.
03 -
Transfer one-third of the melted white chocolate mixture into a small bowl. Add ¼ teaspoon red gel food coloring and stir until color is uniform without white streaks. Adjust red coloring as desired.
04 -
Transfer another one-third of the white chocolate mixture to a separate small bowl. Add ¼ teaspoon green gel food coloring and stir until the color is uniform and free of streaks. Adjust green coloring as needed.
05 -
Spoon dollops of the white, red, and green colored mixtures randomly into the prepared baking pan until all mixtures are used.
06 -
Use a wooden skewer or butter knife to gently swirl the different colored mixtures on the surface, forming a decorative pattern.
07 -
Lightly press the top of the fudge with a small piece of parchment paper to smooth the surface, taking care not to disturb the swirl design.
08 -
Refrigerate the fudge for 2 to 3 hours or until completely set and firm.
09 -
Lift the set fudge from the pan using the parchment overhang. Place on a cutting board and slice into 64 pieces measuring approximately 1x1 inch each. Serve immediately.