Salad. Of all kinds. Just throw together your favorite veggies, beans, add tofu (eggs/meat/fish if you eat that) and nuts and finally a nice dressing. If you wanna be extra lazy, Niku no hanamasa sells a frozen salad mix.

Chili. My recipe is probably not "original" but it's one of my "I can't be arsed to actually cook but want something tasty" meals.
Garlic, onions and soy meat in a pan, add tomatoes, beans and corn. Add spices of your liking.

Pasta sauces. Usually I start out with a tomato base (garlic, onions, tomatoes) and go from there. You can add meat, olives, veggies, etc.

Veggies and tofu stir-fry (make sure to drain tofu).

Curry and Nabe in winter. These are super easy recipes you literally just throw everything in a big pot and cook it. For curry, fry everything then add water and then curry cubes. For nabe, just put everything in a pot and add your soup base, I usually go for whatever I feel like mostly including soy sauce, Morin, etc

Semolina porridge for the morning. A classic from back home. Warm up soy milk and stir in semolina little by little until you have the consistency you want. It's fool proof! Can be served with fruits, jam, sugar-cinnamon, etc.

Hiyashi chuka for summer. Cut up toppings and boil noodles. Cool noodles, put toppings on top and pour over sauce.

Cucumber salad: cut cucumber and add rice vinegar, sesame oil, sesame seeds, soy sauce and mentsuyu.