Being wasteful with the Food for fast breaking
Question :
Does being extravagant in the preparations of food for fast breaking lessen the reward of the fast?
Answer:
It does not lessen the reward of the fast, but it is a forbidden act that is done after completing the fast. It does not lessen its reward, but this is included in the statement of Allâh, the Most High:
"And eat and drink, but do not be wasteful. Verily, He (Allah) does not like those who are wasteful."
Therefore, being wasteful in itself is forbidden, and being moderate is half of livelihood. If the people have something as leftover, then they should give it away in charity, for verily that is better.
Source:
Ash-Shaykh Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 3 Pages 244-245