in a large pot over medium heat, warm the oil. Add the onion and ½ teaspoon salt and cook for 3-5 minutes or until softened.
Add the tomato paste, cumin, oregano, paprika, and chili flakes (if using) and let cook for 30 seconds, stirring often.
Stir in the water, veggies, beans, soy sauce, and remaining 1 teaspoon salt.
Cover the pot with a lid, bring to a boil over high heat, then reduce down to a low/medium-low to maintain a rapid simmer. Simmer, covered, for 15 minutes.
Remove about 4 cups of the broth/beans (make sure to get lots of beans!) and transfer to a high-speed blender. Add the chia seeds and blend on high until smooth and thick (make sure to allow steam to escape while blending). If it’s not blending easily, just add more broth. Stir it back into the soup along with the lime juice.
Serve the soup topped with cheesy tortilla chips, yogurt or sour cream, pickled onions, and cilantro.