Start by hitting 'Saute' on the Instant Pot. Once hot, add the olive oil and finely chopped garlic.
Saute the garlic for a minute and then add the chopped celery, carrots, onions.
Saute the onion, celery, carrots for 3 minutes until aromatic.
Add the dried herb seasoning, salt, and pepper, followed by the diced tomatoes and the vegetable broth.
Give it all a good mix.
Close the lid of the Instant Pot and pressure cook for 5 minutes. Once 5 minutes are done, quick-release the pressure (manual release) and open the lid.
Add sweet corn kernels and heavy cream.
Add the tortellini to the Instant Pot. Set the Instant Pot to the 'Saute' function and simmer for 4-5 minutes, keeping the Instant Pot covered with a lid (any regular pot lid will do).
Once the tortellini is cooked through, your Instant Pot tortellini soup is ready. Add chopped fresh basil for more flavor and sprinkle parmesan over the tortellini soup before serving.