In a 6-quart Instant Pot, place the ham bone, sliced carrots, parsnips, white potatoes, onion, celery, garlic, and split peas. Then, add bay leaf, season salt, and black pepper followed by 6 cups of water. Stir until everything is incorporated.
Place the lid on the Instant Pot, close valve, and set to manual high pressure for 20 minutes. Once the soup is done allow the pressure to naturally release for 10-15 minutes. Carefully relieve any excess pressure with a thick dishcloth or potholder. Always open the lid facing away from yourself.
Carefully remove the ham bone and discard. Using tongs you can grab larger pieces of ham and chop on a cutting board or leave as is. Mix the soup well, and add 3 tablespoons fresh minced parsley and 2 cups of diced cooked ham, mix well. Ladle soup into bowls and top with additional fresh parsley.