Put instant pot on saute mode high and when hot add the butter/oil.
Now add garlic and onion to fry, saute well till onions edges turn golden.
Now add carrots and oats and fry for a minute.
You can skip adding oats now and add powdered oats later once the soup is done.
Add in the tomatoes and mix well. Fry for 3 mins.
Now add in the broth, salt. Mix well.
Put the lid and vent to sealing position. Do manual low pressure 2 mins.
Natural pressure release.
Blend the oats tomato mixture into smooth puree. I used a hand blender.
If you didn't add whole oats before, now you can go ahead and add in roasted and powdered oat flour to the tomato soup. Put on saute mode for 3 to 4 mins.
Now add red chili powder for color and black pepper powder to taste.
If desired adjust the consistency of soup. Serve hot.