Although it's nice to get out of the office for a bit sometimes and come back to the house for rest, many shedworkers kit out their garden office with enough kitchen machinery to make their own meals out there. I've spoken to many who have their own kettle, fridge, toaster, and even microwave.
If all you're doing is boiling pot noodles and drinking cupasoups, then here are a couple of cookbook suggestions you might like to investigate. The first is Meal in a Mug by cookbook specialist Denise Smart published by Ebury. It includes 80 recipes featuring stews, salads, and an impressive range from sticky toffee pudding and elderflower jelly to spinach lasagne and kedgeree. And Christmas pudding.
Here's an example below:
Slightly more complex but also useful is Made in the Office by architect and office worker Rachel Maylor, published by Frances Lincoln [full disclosure: they also publish my books Book Towns and Shedworking].
Here's what the publishers say:
The book shows you that you don't need to have a fully equipped kitchen to knock up avocado and poached eggs on toast (you can poach eggs in the microwave!); and you don't need chef training to make pesto courgette pasta. And you don't need to think ahead the night before, either. You can make 70 quick, simple and healthy dishes in your lunch break.And here's an example: