What are your stupidly easy ways to cook meat and veg?

By stupidly easy, I mean as simple as doing a ready meal.

I have ADHD and I just can't make myself cook. Sometimes even ready meals are difficult.

I want to start meal prepping in a way.

But in a way where I just cook like, 3 separate meats and some separate veg, store them and just take what I want at the time and go.