I don't "meal" prep, but I do cook a majority of my protein for the week on Sundays. A normal Sunday I will cook 6 chicken breasts, 12 chicken thighs, 2-3 lbs of ground meat or a roast. If I'm in the mood for potatoes I will usually oven roast a bunch of potatoes as well. The chicken is all cooked in the oven so minimal involvement other than seasoning.
For most meals it's the meat that takes a majority of cook time. With the meat prepared I usually throw lunches and dinners together in <10 minutes.
Lunches are usually a salad with chicken, lettuce, and whatever other vegetables I have around.
Dinners I keep simple. Usually a stir fry or some sort soup with the chicken.