Can you tell me the story of Laxmichand and the khaja? I heard it shows Baba's omniscience.

Of course. The story of Laxmichand's desire for khaja is a wonderful example of Sai Baba's inner knowledge. As detailed in Chapter 28, Laxmichand, also called Lalaji, was visiting Shirdi and had a craving for a sweet called khaja after tasting it once. His desire remained unfulfilled the next day. On the third day, Baba miraculously ordered, "Bring me a plate full of khaja," for the naivedya, directly addressing Laxmichand's unspoken wish. This chapter also notes that Baba was aware of Laxmichand's hunger and back pain, speaking words that directly mirrored his internal state, which left Laxmichand astonished and solidified his devotion.