SAUCE: Using sautè pan, melt about 3 tablespoons of butter in pan, whisk flour into melted butter, then whisk in milk. Whisk until it begins to thicken, add chicken broth, cheeses and seasonings. Cook until the cheeses melt and it becomes the desired thickness you want. If it becomes too thick, add some of the reserved pasta water or some more chicken broth. Place pasta in serving container, add about 1/2 the chopped bacon, tomatoes and pour sauce over pasta and mix well. Top with diagonally sliced chicken and top with remaining bacon pieces.