Food prep.

Totally new to the whole idea of working out or dieting. Im on the skinnier side after losing my job so im focused on weight gain. I hang out at the house all day so re heating isn't a problem but im trying to figure out how to cook in bulk for a a few lunch and diners a week to cut down on cooking and cleaning. I enjoy basic foods and dont really mind repetitiveness. Trying to keep the budget modest being that im not a baller.