In a large mixing bowl, add the cake mix, sugar, flour and vanilla. Cut the butter into cubes and add into the same bowl. Add the halloween sprinkles and mix until combined
Using a small ice cream scooper, scoop some dough and using your hands, roll into balls.
Using a double boiler, melt the white chocolate
Dip the dough ball into the chocolate
Using a fork, completely coat the ball into the chocolate and place onto the cookie sheet
Sprinkle some sprinkles onto the tops of the balls and place into the fridge for 15 minutes