Using the conveyor belt alone to bring down each ingredient will not be enough, because the conveyor must move the ingredient a minimum of 12 spaces to do this, which translates to 12 moves per ingredient.
8-move candy bombs spawn from the bomb dispensers whenever a match is made below them.
The ingredients are worth 80,000 points, which is more than the three star target score.
There is no difficulty in earning two and three stars as the two and three-star target scores are only 20,000 and 30,000 points respectively. The ingredients are worth 80,000 points which is more than the two and three star score requirements.