May not be a ton of use to you but like someone else mentioned frozen vegetables can be a great idea. They're pretty consistent in texture and size and if you struggle with executive functioning (there can be a lot of prep and steps in a meal) they're great. I value convenience and simplicity a lot so my go-to healthy meal is one that takes maybe 40 mins but most of that is just letting it cook.

I have a cheap rice cooker, I add equal parts rice and red split lentils (they cook at the same rate), water, frozen vegetables (I go with carrots and onions since they're cheap), a splash of olive oil, some spices, salt, and lemon juice just because I like a bit of acidity.

I give them a quick mix and let it go until the pot says it's ready. I'll also make enough for 2 or 3 meals so I can easily reheat some in the microwave later. It's pretty cheap, easy, and in that one meal alone I'm getting 3 of my 5 a day.