Rinse the chicken leg quarters under cold water and pat them dry with paper towels. Place the chicken at the bottom of your slow cooker in a single layer.
Add the minced garlic, salt, black pepper, bay leaves, and oregano over the chicken.
Pour in the chicken broth and tomato sauce, stirring gently to combine. Make sure the chicken is fully submerged in the liquid.
Layer the carrots, celery, potatoes, onion, and corn on top of the chicken.
Cover the slow cooker with the lid and set it to cook on Low for 6-8 hours or High for 4-5 hours. Avoid lifting the lid during cooking to keep the heat and steam inside.
About 1 hour before the cooking time is up, add the zucchini to the slow cooker. Stir gently to combine without breaking up the other vegetables.
Once the chicken is tender and falling off the bone, carefully remove it from the slow cooker using tongs. Let it cool slightly on a plate, then discard the skin and bones. Shred the meat into bite-sized pieces and return it to the slow cooker.
Just before serving, stir in the chopped cilantro. Taste the broth and adjust the seasonings if needed. Serve and enjoy!
Video
Notes
Additional chicken broth or water may be needed if the soup becomes too thick.