This level requires a tenacious strategy - keep plugging away at the icing blockers and you have a reasonable chance of success once most of them are gone.
It is difficult to prevent chocolate from creeping around the lower section, but the conveyor belt stops it from taking over too far. If you are able to spend the time making specials for possible future combination, better to do that than to keep chiseling at chocolate, as it is multiple specials and combinations in the end game that will get you through this level.
The ingredients come down regardless, making this "prepare and then attack strategy feasible.
Once you are ready to attack, it might not take very many moves to blast away the chocolate and watch all the ingredients drop, so do not make the mistake of giving up early or feeling that you did not come close.
When that success finally comes, probably after a few tries, it feels good.