Make the Rice Krispie treats by following the package directions on the cereal box.
In a large pot, melt the butter and stir in the marshmallows. After the mallows have melted, add the cereal and sprinkles. Let it set up in a 9x13 baking dish.
Punch out the star shapes. Spray the star cookie cutter with nonstick cooking spray and punch out the stars. Compress the leftover Rice Krispie treat and punch out a few more stars.
Decorate the top of the treats with chocolate drizzle and more sprinkles. Melt some white chocolate candy melts and transfer to a disposable piping bags. Cut off a small tip and drizzle each star.