In a blender, combine the cilantro, onion, garlic, and aji amarillo paste. Blend until smooth.
Season the chicken pieces with salt, pepper, and cumin.
In a large pot, heat the vegetable oil over medium heat. Brown the chicken pieces on all sides.
Add the cilantro mixture to the pot and stir to coat the chicken.
Pour in the chicken broth and bring to a simmer. Cover and cook for about 30 minutes or until the chicken is cooked through.
Add the potatoes to the pot and cook for an additional 15-20 minutes until the potatoes are tender.
Adjust the seasoning with salt and pepper if needed.
Serve the seco de pollo hot over rice and beans.
Enjoy!