For the Enchilada Sauce: Preheat the oven to 400 F.
On a parchment-lined baking sheet, add tomatillos, onion, and jalapeño. Drizzle with olive oil and gently rub each ingredient. Bake for 15-20 minutes, or until the tomatillos are tender and golden.
Remove from the oven and set aside.
In a blender, add roasted tomatillos, yellow onion, 1 jalapeño (reserve 1 jalapeño and taste test before adding the 2nd), salt, cumin, garlic powder, fresh cilantro leaves, lime juice, and broth, then blend until smooth. Taste test for more salt and more spice once blended.
For Enchiladas: In a medium bowl, mix together shredded chicken, green chiles, cream cheese, quinoa, and ½ cup enchilada sauce. Mix together until creamy.
At the bottom of a casserole dish, add ¼ cup of enchilada sauce and spread evenly. Layer in 2-3 tortillas, 1 cup of quinoa chicken mixture, ½ cup enchilada sauce, and ½ cup of cheese. Repeat layers until the casserole dish is full. Top the top layer with cheese and bake for 25-30 minutes, or until the top is golden brown and bubbly.
Top with a drizzle of sour cream, diced avocado and chopped cilantro.
Notes: Poach and shred the chicken ahead of time, if desired. The chicken will keep best in an airtight container for up to 5 days.