You could check on the following
Borivali khaugalli popular for bahubali sandwich
Bandra khaugalli near Carter road
Mahim khaugalli for kebabs
Churchgate khaugalli for chicken lollypop
Ghatkopar Khau Galli for remix dosa. Street food of mumbai
Vada pav
Dabeli
Golgappa
Kanda poha
Keema pav.
https://tripoto.page.link/KuF4mLTMTdwHJXPc6
Kindly check the above link for mumbai streetfood.