Begin by thoroughly washing the chicken feet. You can also blanch them in boiling water for 30 seconds and remove the outer skin layer, though this is optional.
In a large stockpot, heat the olive oil. Add the onions, carrots, and celery, sautéing until soft.
Add the minced garlic and sauté for another minute.
Place the chicken feet into the pot, ensuring they're well-coated with the oil and veggies.
Pour in the apple cider vinegar and water, ensuring that the chicken feet are submerged.
Bring the mixture to a boil, reduce the heat, and let it simmer. Add the bay leaves, salt, and pepper.
Allow the broth to simmer for around 8 hours. This long cooking time will extract the rich flavors and nutrients from the chicken feet.
Strain the broth, discard the solid parts, and let it cool.
Store the broth in storage containers or bags, depending on your preference.