To a small skillet, set over medium-low heat, add the pumpkin seeds and a pinch of salt. Toast for about 2 minutes, shaking the pan every now and then. When they start to brown, pour them right into the jar of your blender (we’ll be adding more stuff to the blender later!). Cover the blender and pulse until ground, about 30 seconds to a minute.
To a medium to large pot, set over medium-high heat, add the chicken, onion, tomatillos, garlic, poblano pepper, jalapeño, Mexican oregano, chicken broth and 2 teaspoons of salt. Bring to a simmer and cook for about 30 to 40 minutes, until the chicken is cooked and the tomatillos have softened.
Remove the chicken and transfer to a cutting board. Place a strainer atop a big bowl, and pour the liquid through.
Transfer all of the solids (the pepper, onion, tomatillos, etc.) to the blender, along with a cup of broth (you can eyeball this measurement). Add the cilantro to the blender.
Pour the chicken broth back to the pot, along with the hominy and turn the flame to medium-heat. This will warm up the broth and cook the hominy a bit while we blend up the sauce and shred the chicken.
Back to the blender, allowing some steam to escape from the blender, process until very smooth, about 2 minutes.
Shred the chicken using two forks. By this time, the broth and hominy should be very warm. Add the chicken back to the pot, along with the remaining blender green sauce. Give it a big stir and adjust the salt to your liking. I added an additional 2 teaspoons.
Divide amongst bowls and garnish with crispy chips, slices of avocado, radishes, jalapeño, sliced cabbage and/or diced onion.