Heat olive oil in a large pot over medium heat. Add onion and mushrooms; cook and stir until softened, 3 to 5 minutes. Pour in tomato juice and vegetable broth. Stir in corn, rice, black beans, tomato, black olives, taco seasoning, and cilantro. Simmer soup until flavors combine, 20 to 30 minutes.
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Step 2
Ladle soup into serving bowls. Garnish each bowl with 1 avocado half.