I would suggest to ask the ifc to give a milk feed maybe 1.5-2hr before u fetch, so he won’t be that hungry and can wait for ur to cook.
Once u reach home, u can cook fast meal.
I cook my porridge using rice cooker and I set timer for it, so it will be cooked when I reach home. You can do chicken stock and freeze it and use it to cook pasta, noodles etc. Chop ur veggie and meat the night before, so come back home is just to cook only.
It’s not just about the health, but we also need to expose them to a variety of food to get the necessary nutrients (& also prevent picky eating). After 1yo, they get their nutrients from solids, not milk anymore thus u need to find a solution to it instead of giving instant cereals everyday.