Gather the ingredients.
Melt butter in a saucepan over medium-low heat. Add the flour and stir until smooth and bubbly.
Add milk, salt, Worcestershire sauce, cheddar cheese, and 1/4 cup Parmesan cheese. Continue to cook, stirring constantly, until thick and bubbly.
Cut the trimmed toast in half diagonally and place on a baking sheet (or use individual baking dishes).
Arrange turkey slices on the toast and cover with hot cheese sauce.
Top with tomato slices and sprinkle the remaining 1/2 cup Parmesan cheese evenly over the sandwiches.
Place them under the broiler until hot and bubbly and lightly browned.
Top each sandwich with two strips of crispy bacon, placed in the shape of an "X."
Serve and enjoy!