If you want to minimize cleanup and effort, just use a rice cooker.
Costs 30€
Put in rice and lentils at a ratio of your chosing, cook with oil and salt
Optionally spices and tomato paste
Put in frozen veggies either in a steaming basket or directly in the rice
Chuck in an onion (quartered if you’re lazy) and some garlic
Yoghurt on the side
Congratulations you now have a healthy, cheap meal you can make at home or at work. If you eat directly out of the cooker you only need to clean your spoon. No cutting board needed either.