In a large pan, heat the olive oil over medium heat. Add the onion, stir and cook for about 5 minutes to soften it (less if you're using green onion).
Add the garlic and spices, cook for another minute, then add the veggies. If you're using mushrooms or peppers that need time to cook, let them cook for about 5 minutes. If using greens, just 1 minute is enough.
Crumble in tofu and mix it all around. Stur in the nutritional yeast, and taste for salt and pepper.
FInally, pour in the cornstarch mixture and give it a final good mix – it will get nice and creamy and delicious.
Serve hot from the pan with a fresh salad and a hunk of fresh bread. Enjoy!