Preheat your oven to 425°F (220°C), and coat the bottom of a heavy medium-size casserole dish with a layer of creamy salsa verde.
Skip this step if you are making your own tortillas: Soften store-bought tortillas by brushing them lightly with vegetable oil and heating them in a very hot cast-iron skillet for about 30 seconds on each side. Let each tortilla rest until cool enough to handle, and fill it with about 2 tablespoons each shredded chicken and Chihuahua cheese. Roll each tightly, placing it seam-side down in the casserole dish.
When all of the tortillas have been filled, pour the salsa verde over the enchiladas, and distribute the remaining Chihuahua cheese over the top. Bake for about 15 minutes, until the sauce is bubbling at the side and the cheese is browned in spots. If your cheese is not browning, just pop it under the broiler for 2-3 minutes, watching carefully to ensure it does not burn.
Remove the enchiladas from the oven and drizzle with the crema. Sprinkle the Cotija cheese, iceberg lettuce, and pickled onions over the top. Serve immediately.
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