Milk is a great ni'mah
Hadhrat mentioned the hadith in Shamail Tirmidhi:
Ibn Abbas radiyallahu anhu reports, “Khalid ibn Waleed and I both accompanied Rasoolullah sallallahu alaihe wasallam to the house of Maymunah. (Ummul Mu’mineen, Maymunah radiyallahu anha was the maternal aunt of both). She served milk in a vessel. Rasoolullah sallallahu alaihe wasallam drank from it. I was on his right and Khalid ibn Waleed on his left. Rasoolullah sallallahu alaihe wasallam said the right of drinking is now yours (as you are on the right). If you so wish you could give your right to Khalid. I replied that I would give no one preference from your left over. After that Rasoolullah sallallahu alaihe wasallam said, Whenever Allah feeds one something, this du’aa should be recited: Allahumma baarik lanaa fihi wa-at’imanaa khayram minhu (Translation: O’ Allah grant us barakah in it, and feed us something better than it.) Whenever Allah gives someone milk to drink one should read: Allahumma baarik lanaa fihi wa-zidnaa minhu (Translation: O’ Allah grant us barakah in it and increase it for us.) Sayyidinaa Ibn Abbas radiyallahu anhu says that after having something Rasoolullah sallallahu alaihe wasallam made du’aa for something better than it. And after drinking milk he taught to make du’aa for the increase of it, because Rasoolullah sallallahu alaihe wasallam said, There is nothing that serves both as food and water excepting milk.”
Allah SWT has also mentioned milk in the Quran. There will be a river of milk in Jannah.
And verily! In the cattle, there is a lesson for you. We give you to drink of that which is in their bellies, from between excretions and blood, pure milk; palatable to the drinkers. [16:66]
Drink milk at night, you may sleep better. Drink milk then thank Allah.
ghee hasn't been mentioned in the Quran. It isn't good for you.
The description of Paradise which the Muttaqun (the pious. See V.2:2) have been promised (is that) in it are rivers of water the taste and smell of which are not changed, rivers of milk of which the taste never changes, rivers of wine delicious to those who drink, and rivers of clarified honey (clear and pure) therein for them is every kind of fruit, and forgiveness from their Lord. [47:15]
Thank Allah that he has given us many great blessings
May Allah give us tawfiq