Four lunches from one tray of spiced chicken and peppers. Cook the chicken in large pieces and slice it after it rests; small cubes dry out long before they brown.

A burrito bowl is a burrito without the tortilla, which removes about 300 calories of refined flour and leaves everything that was worth eating. This one carries 44g of protein and about 10g of fibre a serving.
The fibre is the part most people are short of. UK guidance is 30g a day, and most adults eat around 20g. Black beans and brown rice do most of the work here, and fibre with protein at lunch keeps blood sugar steadier through the afternoon than a sandwich of the same calories. More in does sugar lower testosterone?
The rice rule for meal prep. Cooked rice can carry spores of a bacterium, Bacillus cereus, that survive cooking and multiply if the rice sits warm. The Food Standards Agency advice is to cool rice quickly, keep it in the fridge for no more than a day, and reheat it only once, until it is steaming hot all the way through. So the chicken, beans and vegetables keep for three days, but the rice does not. Either cook it fresh, or freeze it in portions as soon as it has cooled and reheat it from frozen.
Avocado brings most of the fat, and it is the kind that does not need limiting, but it browns once cut. Add it on the day, or pack half with the stone in and lime on the cut face.
Greek yogurt in place of soured cream adds protein and saves fat, and with the lime and spices it tastes the same in a bowl. For another high-protein lunch, see the tuna and white bean salad, and for a vegetarian version of these flavours, the black bean chilli works with the beef left out.