Im an afficionado of little debbie oatmeal pies and brownies myself.
When purchased at walmart, the 12ct box of oatmeal pies is one of the highest calories/$ things you can get, only thing I know of thats higher is a bottle of vegetable oil. Going off of memory from a few yrs back , the oatmeal pies were ~2150 cal/$ and the vegetable oil was ~3400 cal /dollar or so.
I can always choke those down, no matter how lousy I feel, etc. Extra calories.
I think Warren Doyle used to espouse the Little Debbie thru-hiker diet.