The ingredients can only drop in the centre. You must take the ingredients off the conveyor belt, when it reaches the top/centre.
There is a wrapped candy surrounded by three-layered frosting given, so vertical striped candies or wrapped candy + striped candy combinations must be used to clear one layer of frosting, plus, explodes a wrapped candy that clears 2 layers, where the ingredient exits are located.
Five colours ease the creation of special candies, however.
Try not to have the first ingredient spawn on the extreme columns as it can be difficult to force them to bring them down to the conveyor belt. If this happens, reset the board. This will cost you a life on Facebook, but not on mobile as long as you have not made your first move.
Once the ingredient is properly positioned in place in the centre three columns, destroy candies beneath it so that it does not teleport back to the extreme columns of the board.