Step 1

Melt butter in medium saucepan over medium low heat. Whisk in flour; whisking continuously for 2-3 minutes. Slowly add milk; whisking continuously. Cook over low heat until thickened; stirring frequently. Whisk in ground cayenne pepper. Reduce heat and add cheddar and Parmesan slowly. Continue stirring until cheese is completely melted. Salt and pepper to taste.

Step 2

Toast bread, microwave the deli meat for 10-15 seconds to get the chill off. Assemble sandwich by dividing the turkey over the four slices of toast. Add several tablespoons of the sauce to each sandwich. Top with tomato slices and 2 slices of bacon.  Divide the rest of the sauce between the sandwiches. Sprinkle with a little bit of grated Parmesan and a sprinkle of paprika.  Place under the broiler for 1-2 minutes or until lightly browned.  Make sure you keep an eye on the sandwiches under the broiler as I have always found broilers unpredictable.