Cascades occur readily in this level, and constitute the simplest plan of attack.
Do not worry about the chocolate. It will be destroyed quite incidentally.
Play from the bottom of the board to maximise the benefit obtained from cascades.
As the icing to be destroyed is to one side of the candy area, horizontally striped candies are very useful. It helps to bear in mind that those created in cascade will be striped in the direction of your last move (swipe): try to make horizontal moves, so as to cause horizontally striped candies to be created in cascades.
As always, the following combinations are useful:
Colour bomb + striped candy combinations will deliver enough hits to remove a layer or two off multiple squares of icing.
Wrapped candy + striped candy combinations are also ideal. Line up the combination so that the centre of detonation is between two rows of the icing, as this will strip a layer from the square above and below it.
Striped candy + striped candy combination works too, if one or both is in line with the icing.
Other than that, take all of those candy crush planning skills that you have been working on for months, tuck that bit of your brain back in bed for a few minutes and let the wild, random bit of your brain have some fun with this level. The relentless cascades and combinations just sitting waiting to be used will probably get you through.