Cook the pasta as per the instructions on the pack. Keep it aside.
Heat 1 tbsp oil in a pan. Start with frying carrots on medium heat.
When carrots are about 50% done, add broccoli. Continue frying on medium heat.
When broccoli is about 30% done, add capsicum and continue frying.
Fry for a minute or two. In the end, add mushrooms and fry till all the vegetables are cooked yet crispy. They shouldn't be soft and mushy.
Keep them aside.
In another pan, heat butter and 1 tbsp oil. Add garlic and fry till they turn golden brown.
Add milk and cream. Bring it to a boil.
In a bowl, combine water and cornflour and mix well. Add this slurry to the boiling milk and cream.
You will notice that the milk and cream will start thickening.
Now add the cooked vegetables and pasta. Mix well.
Add salt, pepper, oregano and cheese.
Mix well. Garnish with fresh basil leaves and serve.