Heat the pan with 2 tbsp of olive oil and fry ginger garlic paste until aromatic.
Add onions and saute until golden.
Now, add all the other veggies (capsicum, bell pepper, corn, carrot) and saute for a minute.
Add salt as per taste, 1 tbsp of black pepper, 1 tbsp of ketchup, and saute for a minute.
Keep aside these cooked veggies in a bowl.
In a pan, heat 3 tbsp of butter.
Add 3 tbsp of all-purpose flour (maida) and stir continuously for a minute.
Pour 3 cup of milk little by little while stirring continuously with a whisk.
Reduce the flame to low and continue stirring until the mixture starts to thicken.
Add ¼ tbsp of chili flakes, ¼ of oregano, a pinch of black pepper and salt. Mix well.
Add 2 cup boiled penne pasta and cooked veggies in the white sauce and mix well.
Transfer it to a serving plate. White sauce is ready to serve.