[daikokunyo]

oh i know the feeling! i think single dish meals are great that way, like instant pot meals, and bakes. you make just one dish and it makes a meal or, increase the quantity and carry it over for more than one meal. and for breakfasts, granola and vegan or lactose-free yoghurt with whatever fruit you like is just a packed meal of nutrients that's good on the tummy too.
another thing i love is fermented foods, because you make a batch at once and can feed off it for days or months depending on the food item. and it's SO good on the tummy! probiotics ahoy
of course, when you cook for the rest of your family in the same go, it's difficult to make enough to carry over to your next meal.