Press Saute and oil in the Instant Pot.
When the oil is hot, add chopped Onions. Fry for 2-3 minutes or until they change color.
Add tomatoes to it and then cook for 3-5 minutes or until they turn soft & mushy.
Add water and de-glaze the pot. Now add potatoes, cauliflower, red bell pepper, and carrots. Add Salt & Pav Bhaji Masala and close the lid.
With the vent at a sealing position, pressure cook for 8 minutes. Release the pressure naturally. When it is safe, open the lid.
MAKE ONION MASALA: In another pan, add oil/ butter. When oil is hot, add onion and saute until they turn golden. Next, add garlic and saute for 1-2 minutes. Next, add Kashmiri Red Chili Powder, ½ teaspoon Pav Bhaji Masala, and 1 teaspoon Kasuri Methi. Saute for 1-2 minutes and keep it aside.
Mash the veggies using a potato masher until you get desired consistency.
Add chopped green bell peppers, onion masala, and peas to it. Saute for 1-2 minutes.