Well, are we talking about Jesus as man or Jesus as an aspect of God? In the name of ScienceTM I'll address both.
Jesus-as-man could do this very easily. There's not much to say here, since everyone has probably made a burrito so hot that we can't eat it.
Jesus-as-the-divine, as one of the Trinity, might have some problems as well. See, we can easily say that there is no theoretical upper limit to the temperature of a microwaved burrito, because this is a god-like being we're talking about here. Virtually omnipotent. Really, the limit here is where you stop calling something a burrito and start calling it ionized plasma.
The highest temperature we mortals have been able to achieve on Earth is 3.6 billion degrees Fahrenheit, and this came in the form of a plasma in an experiment conducted way back in 2006. This is, so far, the hottest a burrito could get. Again, though, note that this is a plasma - by this point, most of the divine kitchen would have evaporated into a like but cooler plasma. Jesus, however, remains unfazed.
Let's go one further, though. Let's heat the burrito up to its maximum temperature, and in the process, convert all of its mass into energy. A one-kilogram burrito, then, produces a yield of 8.987551787368176e+16 Joules, or in the long way, 89,875,517,873,681,760 J. The largest nuclear bomb ever designed, Tsar Bomba, had a yield of about 210,000,000,000,000,000 J. So that's about the equivalent of 21 kilotonnes of TNT.
Assuming that Jesus attempts this in the Holy See (because the Pope would totally lend him the Palpal microwave), his little burrito experiment wipes out the entirety of the Vatican and evaporates most of Rome, scorching the Pantheon and boiling the Tiber River.
I believe that is our upper limit of what defines a "burrito." Hope that answers your question.