Creating the Kentucky Turkey Hot Brown Sandwich is simple if you follow these steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Make the Mornay Sauce: In a saucepan, melt the butter over medium heat. Once melted, whisk in the flour and cook for about 1 minute. Gradually add the milk, whisking continuously until the mixture thickens.
3. Add Cheese and Seasoning: Stir in the mozzarella and Parmesan cheese until melted. Season with garlic powder, onion powder, salt, and pepper. Remove from heat and set aside.
4. Prepare the Bread: Arrange the slices of bread on a baking sheet. Toast in the oven for about 5 minutes until lightly browned.
5. Assemble the Sandwiches: Layer the toasted bread with turkey slices, ensuring even distribution. Pour the Mornay sauce over the turkey and top with crispy bacon.
6. Bake Until Golden: Return the assembled sandwiches to the oven and bake for 10-15 minutes, or until the cheese is bubbly and golden brown.
7. Garnish: Remove from the oven and sprinkle chopped fresh parsley on top for a pop of color and flavor.
8. Serve: Let the sandwiches cool for a few minutes before serving. Enjoy the delicious layers of flavors!