Line a 8-inch square baking pan with parchment paper.
Remove the top from the can of sweetened condensed milk and stir in the green food coloring until the milk is bright green. Start with a few drops and add more if needed.
Pour the green condensed milk into a saucepan, along with the white chocolate chips and butter. Warm over medium heat, stirring frequently, until melted and smooth.
Pour the fudge mixture into the prepared pan and spread as needed to cover the bottom evenly. Allow to harden completely.
To Make The Red Layers
Remove the green fudge from the pan and peel off the parchment paper. Place a new layer of parchment paper in the bottom of the pan.
Remove the top from the sweetened condensed can and stir in the red food coloring, until the milk is a bright red color.
Pour the red colored condensed milk into a clean saucepan along with white chocolate chips and butter. Heat over medium or medium low until melted and smooth. Stir frequently.
Pour half of the red fudge into the bottom of the prepared baking dish.
Take the block of green fudge and place on top of the red layer. Gently press down to get rid of air pockets, but not so much that the red fudge squirts out the sides.
Pour the remaining red fudge on top and spread with a spatula as needed to cover the entire green layer.
Cover with foil or lid and place the pan in the fridge to chill and harden. Use the parchment paper to pop out the completed fudge and cut into squares 1 1/2 in size.
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Notes
Nutrition information is provided as an estimate only and will vary based on exact ingredients used and serving size.