In a medium-sized heat-safe bowl, combine the white chocolate chips and the sweetened condensed milk. Place in the microwave, and heat for 25 seconds at a time, stirring well after each 25 seconds. The chips and condensed milk mixture will be stiff halfway through the heating but will become smoother.
After the mixture is a smoother texture, add the molasses and stir until the color of the mixture is a light brown.
Add the spices and mix well.
Lightly spray an 8x8 square baking dish.
Pour fudge into the baking dish.
Evenly spread the fudge using slightly wet, clean hands.
Spread the seasonal nonpareils over the slightly damp fudge. Lightly pat down to set the nonpareils.