Line an 8 x 8 baking dish with foil. Set aside.

Heat the dark chocolate and half of the sweetened condensed milk in a medium saucepan over medium low heat. Stir until chocolate is melted and the mixture is smooth.

Remove from heat and stir in sea salt. Pour into the prepared pan and smooth the top. Place fudge in the refrigerator.

Meanwhile, melt the white chocolate peppermint chunks and remaining sweetened condensed milk in a medium saucepan over medium low heat. Stir until white chocolate is melted and the mixture is smooth.

Remove the fudge from the refrigerator and pour the white chocolate over top of the first layer. Smooth the top quickly.

Sprinkle crushed cookie pieces all over the top of the fudge and gently press them into the top layer.

Allow the fudge to harden for at least 1 hour.

Cut into 30 squares and enjoy!