First of all, switch your instant pot on 'saute' (or similar function depending on your make)
Add the vegetable oil and mix with the spices and salt first before adding finely chopped onion.
Gently stir until the onions start to be 'see-through' and they are much lighter in colour.
Add water and rice and stir.
Add the frozen vegetables on top of the rice and water, but don't mix them in.
Close the lid and set the instant pot function to 'rice' (check your manufactures guide)
Serve as side to your main meal.