Here are mine; some are more suppers for a late night:
Heinz Five Beanz on granary toast
Boiled eggs with granary toast
Omelette with whatever leftovers in the fridge eg half an onion, chunk of cheese, some cherry tomatoes, half a pepper…
Jacket potato in the microwave (finished under the grill for a couple of mins to crisp it), tinned tuna, sweetcorn and salad.
Pasta, pesto, some wilted spinach (from the heat of the pasta is fine) and a precooked chicken breast shredded and stirred through. I also like starting with courgette sliced into half moons cooked in a little oil in a frying pan.
A chili con carne with added lentils for extra protein portion from the freezer (batch cooked previously) and added to a packet of rice if you are really pressed for time to cook rice from scratch. Half an avocado on the top for another of your five a day
I know they aren’t really, really nutritious as not homemade but I also eat the soups in the tubs - the big ones kept in the fridge. I’d fry up some leftover bread into croutons to make slightly more of a meal.
Vegetables and peas stir fried in some soy sauce with rice and eggs is always so easy and you can pack in the veg and use up lots of leftover veg.