Goal: collect all orders and reach 4,200 points to complete the level.
Tips: here you need to collect 15 chocolate and 20 cream/icing. This is another one of those difficult, un-fun levels just don't make any sense. Because: (1) there are only 12 moves to do here, (2) the timed bombs are very, very short, (3) the chocolate and cream are all over the place, (4) it's not easy to get special candies and combos and (5) you can't kill the magic mixer or else game is over, which the most illogical aspect here. Anyway, these tips may or may not work for you. The point is to make best of the situation on hand. Make a move on one side so to remove cream and chocolate. Defuse the initial timed bombs. Do the same on the other side. Defuse the timed bombs. In between, do some special candy combos so to collect more chocolate and cream. If not happening, use boosters if needed. See how this level is done in video below. Good luck.
Candy Crush Saga Level 2521 walkthrough video