#### Prepare the Chicken
**Season and cook**
Preheat your oven to 400°F (200°C). Season the chicken breasts with salt, pepper, and garlic powder. In a large skillet, heat olive oil over medium heat and sear the chicken breasts for 2–3 minutes per side until golden brown. Transfer the chicken to a baking dish.
#### Make the Honey Mustard Sauce
**Whisk the sauce**
In a small bowl, mix mayonnaise, Dijon mustard, honey, and lemon juice until smooth. Set aside half of the sauce for serving.
#### Assemble the Dish
**Layer toppings**
Spread a generous amount of honey mustard sauce over each chicken breast. Top with crumbled or whole slices of bacon, sautéed mushrooms, and shredded cheese.
#### Bake
**Bake the chicken**
Bake in the preheated oven for 15–20 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the cheese is melted and bubbly.
#### Serve
**Garnish and serve**
Remove the chicken from the oven, garnish with chopped parsley if desired, and serve hot with the reserved honey mustard sauce on the side.