Preheat the oven to 375°F.
Char the peppers! If you have a gas stovetop, I prefer to do it there, Turn the heat on low and let the flame hit the peppers, carefully turning often with tongs until the pepper is charred.For the oven, Add the peppers to a baking sheet and let them roast on the highest rack in the oven on 375º for about 15 minutes, turning oven until they are softened and charred on the outside. In a bowl, mix the shredded chicken, charred peppers, chilies, chopped cilantro, 1 cup shredded cheese, seasonings: chili powder, paprika, cumin, chipotle, salt and pepper.
Make the sauce. Blend salsa verde, sour cream, chopped roasted poblanos, garlic, milk, cilantro. Spread 1/2 cup of the creamy salsa verde mix in a 9×13-inch baking dish. Fill each tortilla with the chicken mixture, roll up tight, and place seam-side down in the dish.
Pour the remaining creamy poblano sauce over the rolled tortillas, then top with the remaining cheese. Pop in the oven and bake for 15–20 minutes or until the cheese is melted and bubbling. Garnish with more cilantro, avocado slices, and flaky sea salt.