Add the chile powders, cocoa, oregano, garlic powder and cumin. Whisk well and continue whisking until the sauce thickens and becomes aromatic. This will take 5-7 minutes.
While whisking, slowly pour in the chicken stock. Continue whisking until the sauce thickens, 3-5 minutes.
Stir in the apple cider vinegar.
Season with salt and pepper to taste. Stir and remove from heat.
Combine all of the cheeses in a large bowl.
Spoon 1/2 cup of the sauce mixture onto the bottom of a 9" x 14" baking dish. Spread out evenly using the back of the spoon or a spatula.
Working one-at-a-time, spoon a scant 2/3 cup of cheese onto a tortilla. Roll up tightly, folding in the edges. Place in the baking dish with the seam-side down. I was able to fit 8 in a row in the dish, with another 2 alongside.
Spoon the remaining sauce over the tortillas and spread out evenly.
Sprinkle with the remaining cheese.
Bake until the cheese is bubbling, 10 to 15 minutes.
Serve garnished with the pickled jalapenos and fresh cilantro.
Notes
You can substitute corn tortillas if you wish. If so, quickly fry (5 seconds per side) the tortillas in a skillet with 1/2 cup of vegetable oil. Drain well then proceed to add cheese and roll.