Select the “Sauté” function on the Instant Pot pressure cooker.
Add oil and rosemary sprig to the pot and sauté for 1 minute.
Stir in all the remaining ingredients.
Mix well and cover and secure the lid.
Select the “Manual” function for 6 minutes at high pressure.
Release the pressure naturally then remove the lid.
Frozen veggies may be softer than fresh ones after being cooked. I would suggest you use fresh vegetables because frozen vegetables will become mushy or much softer. To enjoy the real great taste you have to use fresh vegetables.