Line a 11x7 (thinner) or 5x7 (thicker baking dish with parchment paper or wax paper. Set aside.
In a medium saucepan, melt the 2 tablespoons salted butter. When melted, stir in the 1 1/2 cups high quality white chocolate chips, 1 1/4 cup dry sugar cookie mix and 14 ounces sweetened condensed milk. Reduce the heat to low and continue to stir until the white chocolate has just melted. Do not stir longer or increase the heat, white chocolate tends to seize quickly!
Quickly pour the mixture into the prepared baking pan and tap to even it out. Top with your desired 1-2 tablespoons festive holiday sprinkles.
Chill for 1-2 hours, then remove and cut into squares.
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Notes
Storage: I like to store mine in the fridge in an airtight container. Allow it to sit for 15 minutes or so before serving to come to temperature.Freezing: Yes, you can freeze fudge made with sweetened condensed milk. Wrap it well in plastic wrap and freeze for up to 6 months. Like anything though, it will be a little drier after thawing.