Preheat Oven: Preheat the oven to 350°F (175°C).

Season Chicken: Season the chicken breasts with salt on both sides.

Cook Bacon: In a skillet, cook the bacon until crispy. Once done, crumble the bacon and set aside, reserving the bacon grease in the skillet.

Cook Chicken: In the same skillet with the bacon grease, cook the seasoned chicken breasts over medium heat for 4-5 minutes per side, or until golden-brown and cooked through. Once done, set the chicken aside.

Prepare Sauce: In a bowl, mix the dried onion flakes, honey, yellow mustard, and mayonnaise until well combined to create the sauce.

Assemble Chicken: Place the cooked chicken breasts in a greased baking dish. Spread the honey mustard sauce over each breast, reserving some sauce for serving if desired.

Add Toppings: Sprinkle shredded cheese over the chicken breasts. Add sliced mushrooms on top if using, and then evenly distribute the crumbled bacon over the cheese.

Bake: Place the baking dish in the preheated oven and bake for 30 minutes, or until the cheese is melted and bubbly, and the chicken is cooked through.

Serve: Allow the dish to cool slightly before serving. Serve the Alice Springs Chicken with the remaining honey mustard sauce on the side for dipping.