In a medium saucepan, combine 1 cup of unsalted butter and 2 cups of white chocolate over medium-low heat. Stir constantly with a whisk until completely melted and smooth, about 5–7 minutes. Remove from heat and proceed to the next step.

Add 1 cup of sweetened condensed milk to the melted mixture and stir until fully incorporated. Let it cool slightly while preparing the food colors.

Divide the mixture into three bowls. Add green, purple, and orange food colors to their respective bowls. Mix well to achieve vibrant shades.

Line a square baking dish with parchment paper. Pour the green fudge mixture into the bottom, followed by the purple and then the orange mixtures. Use a skewer to swirl the layers together.

Sprinkle the top with Halloween sprinkles and candy eyes. Allow your artistic side to shine!

Refrigerate the layered fudge for about 1 hour to set completely. Once set, check for firmness.

Remove from the fridge and lift it out of the dish using the parchment paper. Cut into neat squares and serve at your gatherings.