First, heat the oil in the pan and add chopped garlic and fry the garlic. After that add the chopped onions and fry them until they turn translucent.
Then add the veggies like chopped carrots, bell peppers, broccoli to the pan and stir the veggies well. Until the raw flavor is gone.
Then add the red chili flakes, pepper powder, salt, and spring onions to the veggies and give it a good stir. So that then can mix with the veggies well.
Now cover the lid and cook the veggies. Once they are cooked add the boiled pasta to the pan and mix the pasta along with the veggies.
After that add the white sauce to the pan and give it a good stir, so that it can mix along with the veggies and pasta.
Check the seasoning and garnish the white sauce pasta with the spring onions and serve hot.