Heat butter in a pan.
Add onion & sauté it for about 2 minutes.
Then add mix veggies and saute till they turn soft.
Add mayonnaise ,tomato ketchup ,oregano, red chilli flakes ,black pepper powder and salt .Mix well
Add cooked pasta .Toss them all together.Cook for 1 minute and turn off the flame.
Thats it.Mayonnaise Veggie pasta is ready.Sprinkle some processed cheese on top.