Select the “Sauté” function on your Instant Pot. Add the olive oil and let it heat for a minute. Once hot, add the finely chopped onion and minced garlic. Sauté for about 2-3 minutes until the onions become translucent and fragrant.
Add the rinsed and drained long-grain white rice to the pot. Stir the rice with the onion and garlic mixture, toasting it for an additional 2 minutes.
Pour in the low-sodium vegetable broth and tomato sauce. Then, sprinkle in the ground cumin, chili powder, and kosher salt. Stir everything together until well combined.
Close the lid of the Instant Pot and ensure the valve is set to “Sealing.” Select the “Manual” setting and adjust the time to 4 minutes on high pressure.
Once the cooking time is complete, allow for a natural pressure release for about 10 minutes. Afterward, carefully switch the valve to “Venting” to release any remaining pressure.
Open the lid and fluff the rice gently with a fork. Serve your Instant-Pot Mexican Rice warm as a delightful side or a base for your favorite toppings.