Turn Instant Pot to Sauté. Add oil and then onion. Cook until the onion begins to soften, about 2 minutes.
2 TB olive oil, 1 yellow onion
Add the ham and continue to cook for 4-5 minutes, stirring occasionally.
8 oz ham
Add all other ingredients and stir. Seal Instant Pot and turn it to the Soup/Broth setting (35 minutes).
2 medium carrots, 1 celery stalk, 1 medium potato, 16 oz split peas, 8 cups broth, 1 bay leaf, ⅛ tsp black pepper
Once the cooking cycle is complete, allow the Instant Pot to vent naturally for at least 20 minutes before manually venting and opening.
Remove bay leaf and stir the soup well to distribute all ingredients.