Traditionally, gumbo is simmered on the stove for hours, but this Instant Pot gumbo recipe will have you eating delicious, hearty, spicy gumbo in less than an hour. One of the ‘rules’ of Instant Pot or pressure cooker cooking is that you shouldn’t add thickeners like flour until the end of cooking. Well, you’re going to break that rule when you’re making this Instant Pot Gumbo. You’ll make the flour-based roux at the beginning and add about 4 cups of chicken stock to pressure cook the dish. Make sure that the bottom of the inner pot has no stuck on bits of food when you begin pressure cooking.