Step 1: Preheat and Prepare the Chicken
Preheat your oven to 375°F (190°C). Pat the chicken thighs or breasts completely dry with paper towels—this is essential for achieving a proper sear. In a small bowl, combine the salt, black pepper, garlic powder, smoked paprika, and onion powder. Season both sides of the chicken pieces generously and evenly with this spice blend.

Step 2: Achieve the Perfect Sear
Heat the olive oil in a large, deep, oven-safe skillet (cast iron is ideal) over medium-high heat. Once the oil is shimmering, add the chicken pieces in a single layer, working in batches if necessary to avoid overcrowding. Sear the chicken for 4-5 minutes per side, until a deep golden-brown crust forms. The chicken will not be cooked through at this stage. Transfer the seared chicken to a clean plate. If there are any burnt bits in the pan, wipe them out, but leave the flavorful golden fond (the browned bits).

Step 3: Craft the Luxurious Honey Mustard Pan Sauce
Reduce the heat to medium. In the same skillet, add the minced garlic and sauté for 30 seconds until fragrant. Carefully pour in the chicken broth and lemon juice to deglaze the pan, using a wooden spoon to scrape up all the glorious browned bits from the bottom—this is pure flavor. Let it simmer for 1 minute. Remove the skillet from the heat. This next step is crucial to prevent the sauce from breaking: in a medium bowl, whisk together the Dijon mustard, whole-grain mustard, honey, sour cream, apple cider vinegar, thyme, and optional cayenne until completely smooth. Gradually whisk this mustard mixture into the warm broth in the skillet until fully incorporated and silky.

Step 4: Assemble the Bake
Return the seared chicken pieces to the skillet, nestling them into the honey mustard sauce in a single layer. Spoon some of the sauce over the top of each piece. If your skillet isn’t large enough, transfer the chicken and all the sauce to a lightly greased 9×13 inch (23x33cm) baking dish.

Step 5: Apply the Cheese Blanket
In a bowl, combine the shredded sharp cheddar, Gruyère, and Parmesan cheeses. Sprinkle this cheese blend evenly and generously over the chicken and sauce, covering the surface completely. For an extra flavor bomb, sprinkle the crumbled bacon evenly over the cheese.

Step 6: Bake to Bubbling, Golden Perfection
Transfer the skillet or baking dish to the preheated oven. Bake, uncovered, for 20-25 minutes (slightly longer if using chicken breasts), or until the chicken is cooked through (reaching an internal temperature of 165°F / 74°C) and the cheese is fully melted, bubbly, and has developed a beautiful, spotty golden-brown crust.

Step 7: Garnish, Rest, and Serve
Carefully remove the bake from the oven. Let it rest in the pan for 5-10 minutes—this allows the succulent juices to redistribute through the chicken and the sauce to thicken slightly. Just before serving, garnish lavishly with sliced green onions and fresh parsley. Serve immediately with lemon wedges on the side for a bright, finishing squeeze over each portion