Step 1: Sauté the Aromatics
Preheat your oven to 375°F (190°C). In a large (12-inch) cast iron or oven-safe skillet, heat the oil over medium-high heat. Add the diced onion and red bell pepper. Cook, stirring occasionally, for 5-7 minutes until softened and beginning to caramelize at the edges.

Step 2: Cook and Season the Chicken
Push the vegetables to the side of the skillet. Add the cubed chicken to the center. Season the chicken with smoked paprika, cumin, chili powder, salt, and pepper. Let it sear undisturbed for 2-3 minutes to develop color, then stir and cook until the chicken is no longer pink on the outside, about 5-6 minutes. Add the minced garlic and cook for 1 more minute until fragrant.

Step 3: Create the BBQ Sauce Braise
Pour in 1 cup of the BBQ sauce and the chicken broth. Stir well, scraping up any browned bits from the bottom of the skillet (this is flavor!). Bring the mixture to a simmer. Reduce heat to medium-low, cover (with a lid or foil), and let it cook for 8-10 minutes, allowing the chicken to become tender and fully cooked through and the flavors to meld.

Step 4: Shred the Chicken & Combine
Using two forks, shred the chicken directly in the skillet into bite-sized pieces. It should pull apart easily. Stir in the remaining ½ cup of BBQ sauce. Taste and adjust seasoning with more salt, pepper, or a pinch of brown sugar if desired. Remove the skillet from the heat.

Step 5: Build the Skillet Layers
Over the saucy BBQ chicken mixture, evenly scatter about two-thirds of the bag of tortilla chips, pressing them down gently so they absorb some of the sauce. Evenly layer the rinsed beans and corn over the chips. Sprinkle the white parts of the sliced green onions over the corn. Pour any collected juices from the chicken over the layers.

Step 6: Add the Cheese Blanket
In a bowl, combine the shredded cheddar and Monterey Jack cheeses. Sprinkle the cheese blend evenly and generously over the entire surface of the skillet, covering everything from edge to edge.

Step 7: Bake to Bubbly Perfection
Transfer the skillet to the preheated oven. Bake, uncovered, for 15-20 minutes, or until the cheese is completely melted, bubbly, and starting to develop golden-brown spots. For extra browning, you can switch to broil for the final 1-2 minutes, watching closely to prevent burning.