How to Make It
Set Instant Pot to Sauté. Add onion, olive oil, and garlic, and cook, stirring occasionally for 2 minutes. Add butter, and let melt. Add flour; cook, whisking constantly, until mixture is slightly browned, about 2 minutes.
Whisk stock into flour mixture until combined. Add corn, zucchini, butter beans, potatoes, and poblano. Bring to a boil. Sprinkle with salt, pepper, thyme, and bay leaves.
Cover with lid, and turn lid valve to Seal, and set to the Soup setting for 7 minutes. Release valve with a towel (being careful of the pressurized steam that will explode out), and release steam until it stops.
Carefully uncover, stir in tomato and cream. Let stand 5 to 10 minutes before serving. Garnish with your choice of pesto, bacon and chives, or crispy shallots or fried onions.