In a small saucepan add heavy whipping cream and simmer, stirring constantly, just until it begins to bubble in the pan.
Stir in butter.
Add 8 ounces white chocolate and stir, over heat until completely melted. Remove from heat and pour into a small glass bowl. Let cool completely and refrigerate until firm, about 2 hours.
Remove from refrigerator and shape into 1" balls. Place on wax paper and pop into the freezer for 30 minutes.
Heat the remaining 8 ounces of white baking chocolate in a small bowl and microwave for 2 minutes, stirring every 30 seconds until completely melted.
Dip truffles into melted chocolate and place onto wax paper. Sprinkle with white jimmies. Let set in the refrigerator to harden.
Notes
These look really fancy but they are actually so simple to make!