>>21446294 (OP)pancakes is the cheapest food you can make, you just need cold water and flour and butter for the cooking itself
if you want cheaper, you can eat random plants at the local park
still cheap but a bit more premium would be homemade pizza, flour, yeast, heated(increase costs technically) water, salt, cheese, crushed tomato. Since it's cooked in an oven, it's also more expensive than heating a frypan