Making the salsa first allows the flavors to marry while you cook the chicken. Add avocado, jalapeño, water, cilantro, vinegar, and salt to a food processor. Blend until silky and smooth, then chill until serving — this creates a refreshingly zesty sauce.
Heat the oven to 400°F and coat a baking dish with cooking spray. In a big bowl, toss chicken thighs, olive oil, spices, garlic, poblano peppers, onion, and cilantro until everything is evenly seasoned. Spread it out in the dish and bake until the chicken is cooked through and veggies are tender, then shred the chicken with forks.
Increase oven to 425°F and lay tortillas on a parchment‑lined sheet. Spray tortillas with oil and warm them just until they’re bendable. Layer cheese, chicken mixture, and more cheese on one side of each tortilla, then fold over and press gently to seal.
Put the filled tacos back in the oven and bake until the cheese melts and tortillas turn satisfyingly crispy. This step gives you the crunch you crave without frying in oil.
Serve your warm tacos right away with a generous dollop of avocado‑jalapeño salsa and a squeeze of lime. The combo of crunchy shell, juicy chicken filling, and cool creamy salsa is unforgettable.