For the Salsa (make the salsa first so it has a chance to chill)
Blend. Add the Roma tomatoes, onion, garlic, jalapeno, cilantro, and lime juice to a blender or a food processor. Pulse until the desired consistency is achieved. This is up to you. Some prefer smooth salsa. Some prefer a chunkier rendition.
Simmer. Heat the olive oil in a heavy-bottomed skillet over medium-high heat. Add the salsa along with the cumin, smoked paprika, and sea salt. Give everything a stir and bring the mixture to a strong simmer. Reduce the heat and continue to simmer for 10 minutes
Chill in the refrigerator. This salsa is best served cold.
For the Chicken
Prep. Preheat the oven to 425 degrees F and line a baking sheet with aluminum foil.
Season the chicken. Add the chicken, olive oil, sea salt, ground black pepper, garlic powder, onion powder, smoked paprika, cumin, and oregano to a large mixing bowl. Toss everything together until the chicken is thoroughly coated in olive oil and seasoning.
Bake. Arrange the chicken on the prepared baking sheet and bake for 25 minutes or until the chicken is no longer pink inside and its juices run clear.
Slice or shred. Allow the chicken to rest for 5 minutes before transferring it to a cutting board and slicing or shredding.
Serve. Divide the chicken between the tortillas, top with sliced salsa, avocado, and fresh cilantro, and serve.