Can you tell me the story about Laxmichand, Sai Baba, and the khaja sweet?

Certainly. The story from Chapter 28 describes how Laxmichand, after having a little khaja (a sweet) as prasad, developed a strong desire for more. This eagerness remained in his mind. Demonstrating his omniscience, Sai Baba later specifically requested a plate full of khaja as a food offering, or naivedya, before the arati. Devotees then brought two bowls full of the sweet. When the arati was complete, khaja was served at mealtime, fulfilling Laxmichand's unspoken attachment and filling his heart with joy. This event was pivotal in establishing his deep devotion to Baba.