I know that it'd be a bad idea to eat solely hot pockets instead of actual food all day, but I can definitely afford the occasional cheeseburger. If nothing else, running lets me enjoy eating.
Of course, but you should still focus on eating healthy, especially since you get a lot of physical activity. Daily multivitamins are also pretty damn cheap (I just got about a year's supply for probably $15 US), definitely enough to worth having.
For breakfast have a Bagle with cheese or creame cheese and a bowl of Fruitloops. That alone can build up over 500 cals
The reason I keep saying stuff like this is a bad idea is because... well, it's a bad idea. There's much, much better you can eat than Froot Loops (yes, that's actually how it's spelled, even though I hate typing it that way). It's a poor suggestion because there are healthier alternatives, Froot Loops being composed of about 41% sugar. They have some fiber spuriously thrown in these days, but it's not very good for you and isn't the sort of thing that will fill you up. "I need to eat a lot of calories" doesn't mean "calories are all that matters and I should literally buy a bottle of corn syrup and drink it for breakfast". People who are into fitness are also into nutrition as a general rule, and there's a good reason for that. This is less a comment towards you specifically than it is towards the other people posting here, though.
Granted, personal taste matters here and I have no idea what you
like, but there's plenty of whole grain breakfast cereals that aren't half-sugar. Personally, I like things like granola (which is also a great thing to just snack on during the day), shredded wheat, Grape Nuts, oatmeal, and other stuff that makes plenty of small children gag, but that's just me. Of course, part of the reason I enjoy eating things like that is because I like how it makes me feel and know that it's good for me, whereas the taste of Chocolate Frosted Sugar Bombs might itself be good but would repulse me anyway because I know it's crap.
Pork rind, bacon, roast pork, pork sausage... You get the idea, if it comes from a pig, it's good eatin'. I'd also recommend using lard as a bread spread (it's quite good with paprika and onions on top), but I doubt it's widely available in USA and I hear you guys refuse to eat lard and internal organs (liver would also be good, but I doubt you'll eat it).
Pork is a fairly difficult to digest meat, and cured/salted pork products are full of far, far more sodium than you need, and nitrites/nitrates and the like. Pork fat/lard is also by far not the best source of fat you can get if you're health/fitness conscious. Granted, I'm not sure how it compares to butter.
[EDIT]
I'm not sure how much of your own cooking you do, but try to find inspiration from different places, potentially. For instance, I like Mexican and (most) Asian food because a lot of it manages to be extremely tasty without being drowned in butter or made out of an entire cow, my point being less to eat those things and more to look around.
Whole grain pasta/bread is also pretty energy dense and a healthy source of it.