Adapted from twosleevers.com. This is a very flavorful chicken soup. It has a little hotsy totsy burst of spice with the first taste, and then the more complex flavors come through slowly. Magic.
It's fairly brothy, and then you heap up all the garnishes you want on top.
This is a little over a gallon of soup.
Cut the onions and tomatoes into chunks so they will fit in the blender or food processor. Put the onions, tomatoes, jalapeño, chili pepper and sauce, garlic and cilantro into a blender or food processor and blend it until it's a thick sauce. You may need to do it in batches, or just keep poking the big pieces down so everything gets blended in.
Add enough oil to the Instant Pot pot to cover the bottom. Press "sauté" and let the oil heat up for a few minutes.
Pour in the tomato mixture and cook, stirring occasionally, for about ten minutes, until any liquid is mostly absorbed. You may need to press "sauté" again to keep it hot.
Cut the chicken breasts into pieces and put them in the pot. Add six cups of water.
Close the top, seal the valve, and press "pressure cook," then the + button until it goes to 20 minutes. When it's done cooking, let it naturally release for 10 minutes, then release the remaining pressure manually.
Open the top and fish out the chicken. Shred it and return it to the pot. Add salt to taste.
Serve the soup with garnishes: avocado slices, sour cream, tortilla strips, shredded cheese, chopped cilantro, and chopped scallions.