Add the carrots, garlic cloves and onion to a food processor and chop until smallish. Add the chopped veggies to a large pot with olive oil on medium to high heat and let them cook until the veggies are softened.
Reduce the heat and add the tomato purée/passata, salt, and fresh oregano. Add more salt to taste.
Add the pasta to the sauce. Stir. Heat it up until everything is warm. Serve and sprinkle the pasta with nutritional yeast.