Sauté the Vegetables: Set the Instant Pot to Sauté mode. Heat the olive oil and add the chopped onions. Sauté for about 3 minutes until softened. Then, add the garlic, carrots, celery, and fennel, and cook for another 4 minutes, stirring occasionally.
Add Remaining Ingredients: Cancel the sauté function. Add the diced tomatoes, chickpeas, vegetable broth, sun-dried tomatoes, oregano, thyme, salt, and pepper. Stir everything together.
Pressure Cook: Close the lid, set the valve to Sealing, and select the Manual (Pressure Cook) mode for 10 minutes on high pressure.
Quick Release: Once the cooking time is up, do a quick release of the pressure. Open the lid carefully.
Add Spinach & Parsley: Stir in the fresh spinach and parsley, and let the residual heat wilt the spinach. Taste and adjust the seasoning if necessary, then serve.
Both methods ensure a delicious, easy-to-make garbanzo bean soup with minimal effort!