Haldiram is a good choice
You can have delhi's famous chole bhature at Nagpal or Anand ji in lajpat nagar.
The Brew Room in SDA is a great option for English breakfast!
Norenj in Gurgaon, Smokey’s BBQ and Grill, Sarvana Bhawan and The Brew Room are pretty good options
For early morning rides.. visit JAIN SHIKANJI Mini outlets at delhi-meerut express way near yamuna (crossing by sarai kale khan).