In a small saucepan, bring the cream and butter to a low boil. Reduce to a simmer and stir until thickened, about 5 minutes. Turn heat off and add cheeses and nutmeg. Stir until completely melted. Set aside.
Make the Sandwich
Preheat oven to 425 degrees F. Arrange the bacon on a parchment lined baking sheet pan and bake until crisp about 15 minutes. Set aside.
Arrange 4 slices of my low carb cloud bread onto a small baking sheet pan. Optional: Spread each slice with 1/2 tablespoon butter. Place into oven for the last 5 minutes that bacon is cooking to toast the bread.
Top each piece of toast with slices of turkey. Add one slice of tomato. Sprinkle salt and pepper if desired on tomato. Spoon sauce over each then sprinkle shredded cheddar over each piece. Broil 2-3 minutes until cheese is melted and golden brown around edges.
Transfer each piece to a serving plate, top with 2 pieces of bacon. Serve hot with a fork and knife.