Preheat oven to 300 degrees. Melt butter in skillet. Stir in flour. Gradually add milk and bouillon; cook until thickened. Add cheese. Stir until cheese is melted; remove from heat. Put toast in flat baking dish. Put turkey on toast. Spoon cheese sauce over meat. Bake 10 minutes. Top with bacon and tomato slices; bake 5 minutes more. Sprinkle with Parmesan and paprika before serving.