Cook macaroni according to packet directions in the salted water. Once cooked al-dente, transfer to a strainer, rinse with room temperature water, and set aside in the strainer itself to cool down completely.
Heat oil in a stir fry pan. Add garlic, green chili, and onion. Sir fry for 1 minute. No need to brown the onion or garlic.
Add vegetables, salt, pepper, and stir fry over high heat for 1 - 2 minutes. Do not cook the vegetables for too long.
Add the secret sauce, white vinegar, green chili sauce, and combine all the ingredients together nicely.
Simmer the sauce for 1 minute and then add boiled macaroni pasta. Combine with the sauce. Cook for 1 - 2 minutes for the pasta to absorb the sauces.
Add green onion, stir to combine, and masala macaroni is ready.
Serve Masala Macaroni warm.