Step 1: Marinate the Chicken
In a large bowl or zip-top bag, combine the chicken pieces and pickle juice. Let this marinate in the refrigerator for at least 30 minutes, or up to 4 hours if you have time. This gives the chicken that iconic tangy flavor that’s key to a true Chick-fil-A experience.

Step 2: Toast the Bread Cubes
While the chicken is marinating, preheat your oven to 375°F (190°C). Spread the cubed bread on a baking sheet and lightly toss with melted butter. Toast for about 10 minutes until lightly golden and crisp. This helps the bread stay sturdy and not turn mushy in the casserole.

Step 3: Prep the Chicken Coating
In one bowl, mix the flour, paprika, garlic powder, onion powder, black pepper, and salt. In a second bowl, combine the milk and eggs. In a third bowl, place the crushed cornflakes or breadcrumbs. Drain the chicken and pat it dry with paper towels.

Step 4: Coat the Chicken
Dip each chicken piece in the flour mixture, then the milk-egg mixture, and finally coat it in the breadcrumbs. Lay the coated chicken on a greased baking sheet or rack.

Step 5: Bake the Chicken
Drizzle or brush olive oil or melted butter over the chicken for a golden crust. Bake at 375°F for 18–20 minutes, flipping halfway through, until golden and cooked through. Set aside.

Step 6: Make the Casserole Sauce
In a mixing bowl, whisk together the Chick-fil-A style sauce, mayonnaise, sour cream, milk or half-and-half, and optional hot sauce. Add a little salt and pepper to taste. This becomes the creamy binder that pulls the casserole together.

Step 7: Assemble the Layers
In a greased 9×13-inch baking dish, spread half of the toasted bread cubes. Layer with half the chopped pickles, half the shredded cheeses, and half the cooked chicken. Drizzle on half of the sauce mixture. Repeat with the remaining bread, pickles, chicken, cheese, and sauce.

Step 8: Bake the Casserole
Cover the dish with foil and bake at 375°F for 20 minutes. Remove the foil and bake for another 10 minutes, or until the top is bubbling and golden brown. Let it cool for 5 to 10 minutes before serving.

Step 9: Garnish and Serve
Top with extra pickle slices or a drizzle of Chick-fil-A style sauce if desired. Serve warm and enjoy that melty, savory, crispy magic in every bite.