Go to any grocery store. Look at a can of yams. What is the price per ounce? It's an easy calculation. Then compare that to fresh yams. See how easy that was? See how cheap it is?
Now price the marshmallow stuff. Then compare it to, say, brown sugar or maple syrup. Throw a banana into the yams before you beat them. Cheaper, I guarantee it.
Cole slaw from a fast food joint? Yeah, right. Buy a frickin' head of cabbage for less than a buck and make your own.
There was a time when I was working a full time job, a part time job (both about minimum wage) and going to university at the same time.That was all I had to pay for rent, food, taxes, tuition and books. There was no, and I mean zero, money for clothing, coffee, eating out (McDonalds was too expensive) or anything else. There was no family to help me, and no one I could turn to if I got in trouble.
I only had enough money to eat dinner three days a week. If I missed a day of work, I didn't eat that day. At all. I was operating on about four hours of sleep a night. If I cooked the way you're claiming is cheap, I would have been eating one day a week.
Don't give me any bullsh** excuses about money or time. If you aren't willing to start from scratch on a few things to save money, then you deserve to go hungry. That's just lazy.