Prepare a 9 x 9-inch baking dish with parchment paper. Spray parchment paper with cooking spray.
Add white chocolate chips and sweetened condensed milk to a large saucepan, and melt over low-medium heat.
24 ounces white chocolate chips, 14 ounces sweetened condensed milk
Stir until the mixture begins to melt and combine. The mixture may be thick but will loosen once the key lime juice is added.
Add the key lime juice, and stir to combine. The mixture should be smooth and creamy.
10 tablespoons key lime juice
Pour into a prepared baking dish. Place in the refrigerator for 3-4 hours to set.
Notes
*The calories listed are an approximation based on the ingredients in the recipe card and a serving size of 2 pieces of fudge. Actual calories will vary.*This fudge is soft set. Meaning it's smooth, creamy, and doesn't hold it's shape well after being out of the fridge for very long. It's best eaten with a spoon. It DOES NOT set up like other fudge made with semi-sweet or milk chocolate.*We DO NOT recommend this fudge for gift giving unless you're giving it in one solid piece still in the pan.