Our lazy day foods are fruit and anything that will take something spreadable (crumpets, toast, rice cakes).
I've also discovered smoothies recently (and as a result my daughter probably eats way too many of them!). I buy the pouches of pureed fruit (ella's kitchen ones, usually), then mix about 1/3-1/2 of the pouch with an equal amount of natural yogurt and a splash of milk. I cut a normal adult straw in half so it's smaller and she'll drink it out of a small cup if I hold the cup for her (otherwise it just gets chucked on the floor). It's basically my answer to fruit yogurt pots. She won't accept a spoon, even if I give it to her, so I made yogurt drinkable. Obviously, you can blend your own smoothies from fresh fruit too (and sometimes I do), but this makes it quick and easy and no kitchen equipment needed.
And while it does involve cooking (but minimal), I also buy fresh stuffed pasta (raviolis, torteloni, etc.), then divide it into individual servings in sandwich bags at home and freeze. Then if I have nothing else, I just boil it quickly in a pot and serve. Obviously, you still have to cook (well, boil water), but there's cheese, meat and veg in there, and it's good finger food, and it only takes a couple minutes and only one relatively clean pot to scrub up after.