Hii Bhawna i spent my whole childhood at chandni chowk so there are some of my favourite food shops here which are less famous but worth trying...
1) Kake Di hatti (nans/ dal/panner)
2) giani faluda
3 )china Raam for sweets.
4) Shiv Bhandar for (halwa Matthi/ jalebi/Bedmi Puri)
5) Nai Sarak For ( chole kulche)
6) khaan omellte
7) chawari Bazar ( Kathi Kabab/chaat)
8) Fruit Cream ( in front of guru dwara shish ganj sahib)
Kake Di Hatti
Giani faluda(mango shake is must try)
Chaina Ram
Annapurna bhandaar for Bengali sweets
Aloo Chaat near haldirams
Patanthe Vali Gali
Natraj Dahi bhalle
Fruit cream
Logan Chole kulche