Add olive oil to a large pot and heat over medium heat until shimmering.
1 lb ground beef
Sauté the chopped onion until it becomes translucent and fragrant, about 3-4 minutes, stirring occasionally.
1 lb ground beef
Add the minced garlic to the onions and cook for another 30 seconds until it releases a warm aroma.
1 lb ground beef
Increase the heat to medium-high, then add the ground beef to the pot. Break it apart with a spoon and cook until browned and cooked through, about 6-8 minutes.
1 lb ground beef
Drain any excess fat if necessary, then stir in the taco seasoning until evenly coated and fragrant, about 1 minute.
1 lb ground beef
Pour in the chicken broth and add the diced tomatoes (with juices), black beans, and corn. Stir everything together to combine.
1 lb ground beef
Bring the mixture to a boil, then reduce the heat to low. Cover the pot and let it simmer gently for 20-25 minutes, allowing flavors to meld and the soup to thicken slightly.
Uncover and stir the soup, checking the seasoning. Adjust salt or spice if needed, then cook for an additional 5 minutes uncovered to allow excess moisture to evaporate.
Turn off the heat and ladle the hot, hearty taco soup into bowls. Garnish with toppings like shredded cheese, sour cream, chopped cilantro, or sliced jalapeños, if desired.
