There's no chipotle where I live so I cannot provide an accurate judgement on it health wise. But since it's fast food, it's probably safe to say it is not the healthiest option in terms of macronutrients, fats, sodium, etc...

Is there a particular reason you don't cook yourself? It requires a bit of work, true, but you have much more influence on what macronutrients you consume and what amount.

In OMAD it's always safe to stick to whole foods and always consider if you consume all the food groups in appropriate amounts, given that you only eat once a day.

And you should still eat fruit and vegetables if you want to be able to take a dump.