Step 1: In a large pot or Dutch oven, brown the ground beef (or turkey) and chopped onion over medium-high heat. Break up the meat with a spoon as it cooks. Once no pink remains, drain off any excess fat.
Step 2: Stir in the rinsed and drained black beans, pinto beans, and drained corn.
Step 3: Add the undrained diced tomatoes, crushed tomatoes, and diced green chilies to the pot. Stir well to combine.
Step 4: Sprinkle in the taco seasoning mix and ranch seasoning mix. Add 1/2 cup of water (or beef broth for a deeper flavor). Stir thoroughly to ensure all ingredients are well combined and seasonings are distributed.
Step 5: Bring the soup to a boil, then reduce the heat to low, cover, and let it simmer for at least 15-20 minutes, allowing the flavors to meld together. The longer it simmers, the richer the taste.
Step 6: Taste and adjust seasonings as needed. Serve hot with your favorite toppings such as shredded cheese, a dollop of sour cream or Greek yogurt, diced avocado, fresh cilantro, and crushed tortilla chips. Enjoy your easy taco soup!