Can you tell me the story of how Sai Baba fulfilled Laxmichand's craving for khaja?

Yes, the story of Laxmichand's fulfilled desire for khaja is a wonderful example of Sai Baba's omniscience. As detailed in Chapter 28, Laxmichand enjoyed some khaja (a sweet) that was served as prasad on his first day in Shirdi. He missed it the next day, and this desire remained in his mind. On the third day, when devotees went to ask Baba what naivedya (food offering) He would like, Baba specifically requested a plate full of khaja. Later, after the afternoon arati, Baba announced He felt like having khaja prasad and told everyone to serve it. This fulfilled Laxmichand's unspoken wish, filling his heart with joy and solidifying his devotion to Baba.