Agarwal bhojanaalay makes simple , bland food which reminds you of food cooked in home. Most economical and filling in menu would be thali as it costs between 60-90 bucks you do get rice and roti(both).
Affordable 'Ghar ka khana' with the quintessential Rajasthani flavours. Regular Thalis are filling and aptly priced. One may choose according to his diet. Parathas are good, probably the best one can find in Potheri.