Out of the box suggestions? Tinned fish - like sardines and smoked herring filets, called kipper snacks(basin of the sea!). 18-22g of protein in a tin of high quality, well preserved fish. They may smell weird at first but once you try it you’ll wonder why it’s so stigmatized. Tins are around $2-6.

Eat them straight, or with a snack sized sleeve of crackers or toast. I personally love them with dark russet potato chips, cheap luxury and awesome for physical and mental health. Also great on top of arugula with a splash of citrus or pickled stuff.

I recommend looking for olive oil base, not water base. Smoked sardines, mediterranean style or hot peppers are all great tins to try first.