I do meal prep with some nicer meals on Sunday for three days.
On Wednesday I make some low-effort mealprep again, but with simpler recipes (mostly stir-fry noodles).
This means no boney meat here for protein. Only stuff like canned tuna or chicken breast. Tofu is also an easy protein source. For vegetables I only use the food processor, because cutting with knives is too slow. For carbs I use noodles.
If I am too exhausted on Wednesday for even that, I just eat some oats with milk with a protein shake on the side and some vitamin pills.