Turn on a multi-functional pressure cooker (such as Instant Pot®), add butter, and select Saute function. Add onions, carrots, and celery; saute until onions are translucent, 5 to 7 minutes. Season with salt and pepper and remove to a bowl.

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Add chopped and sliced baby bella mushrooms, white mushrooms, and wine to the pot; sweat mushrooms until soft and alcohol has cooked off, about 5 minutes.

Stir in 1/2 teaspoon salt, Cajun seasoning, paprika, thyme, sage, and red pepper flakes. Add stewed tomatoes with juice, tomato paste, soy sauce, Worcestershire sauce, and garlic. Simmer until heated through, 3 to 4 minutes. Add onion mixture back to the pot and stir to combine.

Add potatoes, kidney beans, peas, lima beans, parsley, and bay leaves; stir until combined and bay leaves are submerged. Close and lock the lid. Select high pressure according to manufacturer’s instructions; set timer for 8 minutes. Allow 10 to 15 minutes for pressure to build.

Release pressure using the natural-release method according to manufacturer’s instructions, 15 minutes. Release remaining pressure carefully using the quick-release method according to manufacturer’s instructions, about 5 minutes. Unlock and remove the lid. Stir in sour cream, followed by cornstarch if thickening is needed.