Step 1: Sauté the Aromatics
Preheat your oven to 375°F (190°C). In a large, deep oven-safe skillet or a Dutch oven, melt the butter over medium heat. Add the diced onion and bell pepper. Cook for 5-7 minutes, until softened. Add the minced garlic and cook for 1 more minute until fragrant.

Step 2: Build the BBQ Chicken Filling
To the skillet, add the shredded chicken, 1 cup of the BBQ sauce, chicken broth, smoked paprika, chili powder, and cumin. Stir well to combine, scraping up any browned bits from the bottom of the pan. Season with a pinch of salt and pepper. Bring to a gentle simmer and let it cook for 5 minutes, allowing the flavors to meld and the liquid to reduce slightly. Remove from heat.

Step 3: Create the Cheesy Vegetable Layer
In a large mixing bowl, whisk together the condensed cheddar cheese soup and sour cream until smooth. Stir in the remaining ½ cup of BBQ sauce. Fold in the shredded cheddar and Monterey Jack cheeses, drained black beans, and drained corn. Pour this cheesy vegetable mixture into the skillet with the BBQ chicken. Gently fold everything together until evenly combined. Taste and adjust seasoning if needed.

Step 4: Prepare the Biscuit Topping
Open the can of biscuits. Separate them and, using a sharp knife or kitchen shears, cut each biscuit into quarters (for smaller, more pull-apart pieces). Arrange the biscuit pieces evenly over the top of the cheesy BBQ chicken mixture in the skillet. They can be slightly nestled in but should mostly sit on the surface.

Step 5: Butter and Bake
Brush the tops of all the biscuit pieces generously with the 2 tablespoons of melted butter. Sprinkle lightly with dried parsley or Everything Bagel seasoning for color and extra flavor.

Step 6: Bake to Bubbly, Golden Perfection
Transfer the skillet (or if you used a pot, transfer the mixture to a greased 9×13-inch baking dish first) to the preheated oven. Bake, uncovered, for 25-30 minutes, or until the biscuit topping is puffed, deeply golden brown, and cooked through, and the filling is bubbling vigorously around the edges.

Step 7: Garnish and Serve
Remove the casserole from the oven and let it cool for 5-10 minutes. This allows the filling to set slightly for easier serving. Garnish with fresh chopped chives or green onions. Serve hot directly from the skillet, offering extra BBQ sauce and sour cream on the side