You really want to avoid packaged & processed foods.   I can't think of
something that comes prepackaged that you can put in the micro.

Why not canned tuna, sardines, (in addition to those other snack items) etc?

Not really, because sugar and starches are used as preservatives in
packaged foods, so even things that could be low-carb if you made them
yourself will be high-carb when pre-packaged.

In the microwave, I like to spread shredded cheese on a plate, top
with mushrooms, jalapenos, or other pizza toppings, and nuke until the
cheeze is all bubbling.  Then just eat with a fork.

If I have cooked meat, like leftover chicken that I've taken off the
bone, I'll put it in a bowl with cream cheese and heat it up in the
microwave and stir for a quick snack.

    You can cook meat and steam low starch veggies
    like broccoli and cauliflower in a microwave.
    Chicken, turkey and fish won't toughen up like
    beef and pork.  You can use spices with color
    like paprika, chili powder, seasoned salt, curry
    powder, pepper, etc. to add color and flavor.
   
    I eat almost all of my meals in a dorm room
    type of environment.  I get by really well with
    a hot plate, a two quart covered saucepan, a
    12 inch covered chicken fryer (a big, deep,
    covered, thick-bottom pan), a rice cooker
    (works as a second self-heating pan for making
    tea, steaming veggies, etc.), a bowl, a dinner
    plate, and assorted utensils.  The above setup
    isn't too expensive and produces food that is
    tastier and more varied than what you can do
    with a microwave.  Add to that a diet scale and
    journaling software to really do your diet right.

    Another level of pure simplicity is canned stuff
    and supplements.  The fastest on-plan meal I know
    of is a serving or two of protein powder, a table-
    spoon of fish oil, and whatever other supplements
    your plan includes.  A jar with a lid and water
    is all you need for that.  And another great on-
    plan meal is a can of fish like salmon, mackerel
    or sardines and a can of some vegetable like green
    beans.  I usually add a little hot sauce to the
    fish and veggies to add flavor and heat.  All you
    need for that type of meal is a can opener and a
    fork.  Obviously you don't need refrigeration to
    store canned stuff, and the canned fish is an
    outstanding value while being a nearly perfect
    low carb food (economical source of protein and
    essential fatty acids).

    For more variety, if you don't mind upping the carbs
    occasionally, you can cook brown rice in the rice
    cooker with whatever flavoring you like.  I like
    soy sauce or chicken bullion powder.  Another cheap
    higher carb treat is oil-popped popcorn made in the
    big pan.  With a scale and journaling software you
    can work occasional reasonable amounts of rice and
    popcorn into your diet if your not diabetic or
    a victim of high metabolic resistance.  You can heat
    the canned veggies in the rice cooker.  Another
    moderate carb treat is canned chili in the rice
    cooker.  For tighter carb control you can get chili
    with no beans.  One of my favorites is the canned
    mixed vegetables.  The mixed veggies contain some
    potato so the carbs are a bit higher but not too bad.
    A common method for me is to start with a tablespoon
    of olive or canola oil in the big pan on top of the
    hot plate.  From there I cook veggies or sausage
    and then pour in two eggs that I scrambled in the
    bowl.  The result is a tasty and quick omelet (a low
    carb staple).  The same goes for meat.  A tablespoon
    of oil, then put in the meat, season the meat, and
    then add the veggies, chili or cooked rice so that
    the flavors can blend.  If the pan is non-stick,
    start with enough water to steam raw veggies
    like broccoli or cauliflower.  Cook both the meat and
    the raw veggies in the water at the same time to create
    a tasty one-pan on-plan meal.  An omelet to start the
    day, meat and veggies later on, and supplements, tea
    and water round out a typical day of eating for me.
    And it can all be done in a dorm room if need be.
    Fresh food is the best.  A refrigerator may be asking
    too much, but if you have one or access to one, make
    use of it.  If not, try to arrange regular trips to
    the market so you can include as much fresh stuff (raw
    meat, eggs, a little cheese, and fresh raw veggies)
    in your diet as is possible.  When you don't have time
    for fresh stuff, fall back to the canned stuff and
    protein powder.
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