Ok! Here goes with what I usually put in my burritos (which aren't breakfast burritos), but they are really flexible and you can change them up however you want. hnjjjjjjjg (err.. my cat says "hi!") The more you make, the easier it is to make a lot of different fillings and still use everything up, the trick is to only add a little of each thing to every burrito.
Seasoned rice - cooked with tomato sauce replacing part of the water, add cumin for flavor
Sauteed onions and bell peppers
Homemade guac (onion, cilantro, lime juice, avocado)
Corn or corn salsa (corn, cilantro, lime juice)
Black beans, seasoned with taco seasoning
Vegetarian re-fried beans
Daiya cheese shreds (optional)
Hot sauce/taco sauce
That's the basic list, sometimes we will add something else, but we usually have all the stuff listed there. I make some spicy with hot sauce, and others not so much, and label them each as "spicy" or "mild." Like I said, smaller burrito shells work better for reheating, or you will end up with parts of your burrito boiling and other parts frozen solid still. Two small burritos take two or three minutes in the microwave.
A tip on tortillas: Try to find a good quality tortilla where they will fold without having to heat them up, especially if you are making a lot. Some brands will crack when you go to fold them if they haven't been heated. There's no rule that you can't take the time to heat them up, if you do make a few at a time and store them in a foil packet to keep them warm until you fill them, but it is quicker if you have a soft enough tortilla you don't have to do that.