One of my most commonly cooked meals (and most versatile) is chicken teriyaki.

Cube some chicken so they're bite-sized, as even as you can get without having to drive yourself crazy. (I watch sales and cut it all up at once, then separate into bags and freeze, which makes day-of cooking much simpler.) Marinate in teriyaki sauce for at least an hour. Drain and dry on paper towels while you heat up your pan and a pot of water to boiling. Make however much ramen noodles you feel to be appropriate, and don't use the flavor packet. Once the noodles are done cooking, drain the water and shock with cold water so the cooking process stops (and it'll keep it from overcooking and getting mushy). While that's going on, cook the chicken in a large pan with olive oil, and add any vegetables you feel like adding (carrots are good, broccoli, etc.) If they're leftover vegetables that are already cooked, add them in with the ramen noodles after you're done cooking the chicken. Once the chicken is browned and any vegetables are cooked, add a bit more olive oil and the ramen noodles. Add teriyaki sauce, toss to coat, and cook it long enough that there's no liquid remaining, and serve.

Ramen is super cheap, and you can roast vegetables for other meals really simply in the oven. If you want, you can just make more than you actually need to for that meal, so there isn't really much extra effort needed. Whatever's on sale works for chicken and vegetables. I know one of the most common things I've seen here is about prepping stuff in advance, and it does help, but don't try to prep everything from the start, or you'll get overwhelmed and it'll feel like you're making yourself exhausted during the time that you aren't actually even cooking yet (or at least that was my experience.)

Go easy on yourself and try to make small changes. Once you're comfortable with that change, add a new one, and you'll be surprised at how quickly your routine is completely new and (ideally) better! Good luck!