Sort the beans, discard any stones or debris. Rinse the beans under running water, soak the beans overnight in about 7-8 cups of water.
Chop up the veggies.
Slice the sausage into 1/4 inch thick slices.
Press the 'SAUTE' button, set it to "NORMAL' and wait until it displays 'HOT'. Add the oil, once it heats up, add in the sliced andouille sausage, and sauté until the edges of the sausage begin to brown.
Add the chopped veggies, sauté for another 4-5 minutes or until the onions turn translucent.
Add the minced garlic, and sauté for another 30 seconds.
Add the spice mix and mix well.
Drain the beans, discard the water. Add the drained beans to the sausage-veggie mixture, along with the chicken broth, and bay leaves. Mix well.
Press 'CANCEL', close the lid of the Instant Pot with the valve on sealing position. Press the manual or pressure cook button and pressure cook on high for 15 minutes. It will take some time for the pressure to build up (about 18 minutes), after which the timer will start.
Let it depressurize naturally for 20 minutes, then do a quick release of leftover pressure following the manufacturer's instructions. Once the silver pin drops, turn the knob to venting and open the lid.
Discard the bay leaves. There will be liquid in the pot, at this stage you can turn on the saute button and cook uncovered so that the liquid reduces, mash some beans with the back of a ladle to thicken the gravy. Or transfer 1 cup of the cooked beans along with some of the liquid and blend it. Transfer the pureed beans to the pot, and cook for another 4-5 minutes. You will see the gravy thickening up.
Taste and adjust seasonings as required. Finish it off with a splash of apple cider vinegar or add some in individual serving bowls. Serve over cooked white rice. Garnish with minced parsley, scallion greens, and some hot sauce.