Reduce the heat, and allow to cook for 10 minutes, stirring intermittently. Using an immersion blender (or a regular blender) blend the soup until thickened. Stir in the remaining can of beans and cook for 5 more minutes. Add salt (or garlic salt, if you have it) to taste. Serve warm with your favorite toppings (such as diced avocado and cilantro) and enjoy!