1. Preheat your oven to 450 degrees F. Line two large baking sheets with parchment paper and arrange the tomatillos and Anaheim peppers cut side up. Roast them until the tomatillos have turned golden brown, about 5 to 7 minutes, and the peppers are nicely charred. Keep an eye on them, as ovens can vary.
2. Once roasted, transfer the peppers to a brown paper bag, sealing it tightly to allow them to sweat for about ten minutes. This step makes peeling them much easier. After the time is up, carefully peel the skins off the peppers, revealing their tender flesh.
3. In a blender or food processor, combine the roasted peppers, tomatillos, jalapeño, onion, garlic, cilantro, cumin, paprika, lime zest, lime juice, sugar, and salt and pepper to taste. Blend until smooth. The mixture should be vibrant and aromatic.
4. Next, dice the remaining Anaheim peppers and pour the salsa verde into the slow cooker. Add the chicken broth, diced peppers, and the chicken breasts. Make sure the chicken is submerged in the liquid. Season with additional salt and pepper as needed.
5. Set your slow cooker to high and cook for about 3 to 4 hours, or on low for 6 to 8 hours, until the chicken reaches an internal temperature of at least 165 degrees F. The chicken should be tender and easy to shred.
6. Once cooked, use a slotted spoon to remove the pieces of chicken from the slow cooker and transfer them to a cutting board. Shred the chicken using two forks, returning the shredded meat back into the slow cooker with the chile verde sauce. Stir everything together, tasting and adjusting seasoning with salt and pepper if needed.
7. Serve the Slow Cooker Chicken Chile Verde warm, alongside warm tortillas, beans, and rice. The combination of flavors and textures will leave everyone craving more!