Start by combining the coleslaw mix in a large bowl. In a separate bowl, whisk together mayonnaise, sugar, vinegar, salt, and pepper until smooth. Pour the dressing over the slaw and mix well. Refrigerate it for at least 30 minutes to let the flavors develop.
In a small bowl, mix mayonnaise, sriracha, and chipotle powder. Stir until the sauce is creamy and well blended. Chill it in the fridge so the flavors can intensify. This sauce adds a smoky and spicy kick to the tacos.
Shred the rotisserie chicken into bite-sized pieces. Toss it with barbecue sauce until evenly coated. This step ensures every bite is flavorful and juicy. Set the chicken aside while you prepare the other ingredients.
Heat your grill to medium and place pineapple rings and bell peppers directly on it. Grill the pineapple for about 2–3 minutes per side until caramelized. Cook the peppers for 4–5 minutes per side until slightly charred. Slice everything into small pieces afterward.
Place tortillas on the grill for about 30 seconds on each side. This makes them soft, warm, and slightly smoky. Be careful not to overcook, as they can become crispy. Keep them wrapped in a towel to stay warm.
Lay out the tortillas and start with a layer of coleslaw. Add the BBQ chicken, grilled pineapple, peppers, and red onion. Sprinkle cheese on top and drizzle with spicy mayo. Finish with parsley if desired and serve immediately.