First thing that came to mind was omlette.
You can whisk up some eggs in a pan and cut a few slices of cheese and chuck a slice of ham etc into the pan all with one hand - it`ll still taste the same even if you havent grated it... and omlette can be eaten with one hand too.
The eggs are good for your energy too - which you really need!
Could be a good lunch option in these early weeks.

Also, fruit smoothies can be made in advance and put in the fridge. A good thick one with 1 -2 banana, apple , yogart/milk/juice and all that will give you a bit of a good energy. Dont make smoothies more than a day in advance though, or they loose too much of the nutrients and wont taste as good. You can whizz these up in a couple of mins (or you DP could before they head off to work), stick it in the fridge (with a lid) and then grab it to drink while feeding or whatever later in the morning....

HTH