Set your pressure cooker to the sauté method. If using a pot on the stove top, preheat it over medium.
Add the butter and olive oil directly into the pot and allow it to melt and heat up.
Add the smoked beef sausage into the oil and sauté for about two minutes. Stirring occasionally so that it can brown evenly on each side.
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Next add the diced bell pepper, onion, and celery into the pot and sauté for about two minutes, stirring occasionally so that it does not burn.
Add the dried kidney beans directly into the pot, and pour the six cups of water over them. Stir it around to combine the beans with the vegetables.
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Now sprinkle all of the seasonings into the pot with beans. Add the cajun seasoning, seasoned salt, chicken bouillon, bay leaves, garlic powder, oregano, and black pepper. Stir it around until it is all fully combined.
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Nestle the smoked neckbones directly into the beans. Place the lid on the pressure cooker and set it to the "bean chili" mode. Set the timer for 45 minutes and let them cook.
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After the first 45 minutes, open the lid and remove all of the bones from the neckbones. This should be easy because they will be nice and tender.
Stir the beans up thoroughly . Then taste the beans for seasoning, and adjust to your liking. Place the lid back on and cook for an additional 45 minutes.
Remove the lid and stir the beans up. Gently mash them a bit so that the beans will thicken. Place the pressure cooker on the sauté mode for about 3 minutes, stirring continuously.
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Serve the beans with the cooked white rice, and garnish with parsley or green onions if desired.