Scumbags, What is the best , most nutritious thing to meal prep?

My main goal is to lose my belly fat. I eat like shit all the time, but also eat my proteins and take my greens and shit. I wanna say dream and imagine myself at my best health. What’s a good basic meal prep for lunch and dinner. I have been doing chicken , sweet potatoes and asparagus for my work lunch. But that’s it. Anyone wanna danna dumb down a quick basic daily meal guide down. Keeping in mind that I would like the diet to have a positive effect on my testosterone.