Your first priority is destroying the cake bombs. It can be hard as the sides have very limited space, so use special candies.
Once the five-layer icing has been mostly dealt with, liquorice swirls will begin to pour into the level, but they are not a huge obstacle. Simply destroy any in your way.
The rest is simple, just make matches or special candies to bring down the ingredients. It is necessary to destroy the top icing square in the center column to release any ingredients; this can be most easily accomplished by destroying both cake bombs. Until you destroy that square, no ingredients will be released onto the board.
Trivia
Bringing the ingredients down gives the player enough points to meet the target score.