मिष्ठान
The correct word is “मिष्टान्न” , which is wrongly pronounced and used as “मिष्ठान”
मिष्ट – ( मिष् + क्तः ) means मधुररसः
Reference in Agni Purana
मिष्टान्नपानदाताथ सततं श्रद्धयान्वितः ।
देवपूजापरो नित्यं न प्रेतो जायते मृतः ||
Meaning
The one who offer sweets and leaves to devata during worship, he will never become a ghost after his death.