Prepare the Baking Dish: Line an 8x8-inch baking dish with aluminum foil or parchment paper.

Melt the White Bark: Microwave the white bark or chocolate chips in 30-second intervals until melted.

Mix in the Condensed Milk: Stir in the sweetened condensed milk and cotton candy flavoring until well combined.

Divide and Color the Mixture: Split the mixture into two bowls, adding food coloring gel to each.

Layer the Mixture: Scoop alternating spoonfuls of colored mixtures into the prepared baking dish.

Swirl the Colors: Use a toothpick to swirl the colors together gently, creating a marbled effect.

Refrigerate to Set: Chill the fudge in the refrigerator for about 2 hours until firm.

Cut and Serve: Lift the fudge out from the dish using the foil or parchment and cut into pieces.