01 - In a medium bowl, whisk together olive oil, lime juice, garlic, cumin, smoked paprika, chili powder, salt, and pepper. Add chicken pieces and toss to coat thoroughly. Let marinate for at least 15 minutes while preparing the salsa.
02 - Combine diced pineapple, red onion, jalapeño, cilantro, lime juice, and a pinch of salt in a mixing bowl. Stir gently to incorporate all flavors. Set aside at room temperature to allow flavors to meld.
03 - Heat a large skillet over medium-high heat. Add marinated chicken in a single layer and cook for 6 to 8 minutes, stirring occasionally, until chicken is cooked through and develops a light golden-brown exterior.
04 - Heat tortillas in a dry skillet for 30 seconds per side until pliable and lightly toasted, or microwave wrapped in damp paper towels for 20 to 30 seconds.
05 - Place cooked chicken onto each warmed tortilla. Top generously with pineapple salsa, arrange avocado slices over the top, and garnish with additional cilantro leaves if desired. Serve immediately with lime wedges on the side.