Add the dried peppers, garlic, onion, bay leaf, tomatoes, cinnamon stick, peppercorn, salt, and oregano to a large, heavy bottomed pot. Cover with water (about 6-8 cups, but it'll depend on the size of your pot). Simmer the mixture until soft, about 45 minutes.
When the sauce has about 15 minutes left to simmer, add the butter to a heavy bottomed pot on the stovetop over high heat. Cut the chuck roast into 4-5 even pieces, season liberally with the other teaspoon of salt, then sear the meat for 4-5 minutes, flip, and sear on the opposite side for 4-5 minutes. Once seared, set the pot aside.
Preheat the oven to 325°F.
Drain the water from the simmering pepper sauce ingredients, remove the bay leaf and cinnamon stick, then blend the rest of the ingredients, plus the apple cider vinegar until smooth. If it's too thick, you can add up to a cup of broth until it's blendable.
Pour the pepper sauce over the meat. Fasten a lid on the pot and bake at 325°F for 2 hours, until the meat is fork tender. Remove the pot from the oven, and raise the oven temperature to 375°F.
Pull the meat out of the pot and use two forks to shred it.
Dip the tortillas into remaining pepper sauce, making sure to fully coat both sides. If there isn't enough sauce in the pot (or it's too thick), stir in ½-1 cup of broth to thin it out.
Place the dipped tortillas on a parchment paper-lined baking sheet, then add a tablespoon of shredded cheese to one half of each tortilla, followed by a 1/4 cup of shredded beef, and then top with another tablespoon of shredded cheese. Fold the tortillas in half, spray them with avocado oil, and bake at 375°F for 10 minutes.
After 10 minutes, flip tacos, spray the other side with avocado oil, then bake for 5 more minutes. Garnish with chopped fresh onion, fresh cilantro, a side of pepper sauce for dipping, and enjoy!