To one and a half year old you can give everything that you yourself eat in your meals. You can make it more nutritious, however. Try giving stuffed parantha, beetroot dosa, carrot idli, ragi dosa, vegetable cutlets, etc. Try to balance out with 3 main meals 2 snacks/fruits and milk twice a day.

Idli ( plain idli, rava idli, cucumber idli, ragi idli, beetroot idli...) Dosa ( normal dosa, mixed flour dosa, moong dal disable, besan dosa) khichdi, sabudana ( my baby's fav), upma, pongal, sweet puha, chana palav, multi grain roti, dhokla.