Can you tell me the story of how Sai Baba satisfied a devotee's craving for khaja?

Certainly. The Sai Satcharitra recounts the story of a devotee, Laxmichand (also referred to as Lalaji), who developed a strong desire for the sweet known as khaja. As described in Chapter 28, he received a small amount as prasad one day but his craving remained unsatisfied the next. On the third day, in a display of his omniscience, Sai Baba specifically instructed his devotees to bring him 'a plate full of khaja' as a food offering. Later, he told everyone to serve as much as they wanted. This act fulfilled Laxmichand's unspoken wish, filling his heart with joy and deepening his faith in Baba.