Boxed macaroni and cheese is a rite of passage. If you didn't eat it as a young 'un, you're probably not American.
I'm pretty sure it was the first thing I ever cooked on my own, with my tiny apron, and my tiny step stool, and my tiny fire extinguisher. And even then, I messed around with the ingredients. Growing up in a sparsely stocked kitchen (yeah, we were poor) meant making do with what we had. Sure, there was a #failplate or two (Spam + Twix comes to mind), but things came out pretty good for the most part. Even though I'm rich now (compared to 7-year-old Perry) and don't have to eat Kraft dinner, I still do, I just eat more. Yes, that was a reference to the Barenaked Ladies... so I guess Canadians get it, too.
A little note on how we did this: We calculated the cost of each recipe by how much it’d be to purchase the minimum number of individual ingredients (not cost per serving). Because alas, we can't buy only four tablespoons of butter or an ounce of milk at the supermarket. Good news is, you'll have enough butter and milk to make more of these for way less than 10 bucks.