Goal: collect all ingredients and reach 20,000 points to complete the level.
Tips: this is a difficult level and does not make sense, most of the time. You need to remove the pie (aka cake bomb) and you need to process some keys as well (example video below didn't process all). The exploding pie will bring out the ingredients and if you can also unlock the chocolate in the bottom before it happens, even better. Otherwise, everything has to be done within 13 moves which is not easy. See how this level is done in video below. Good luck.
Candy Crush Saga Level 2517 walkthrough video