To prepare sauce, melt butter in a medium saucepan. Add flour, stirring well with a whisk. Gradually add milk, pepper, and salt, stirring constantly with a whisk until blended. Place over medium heat; cook until thick (about 5 minutes), stirring constantly. Remove from heat; stir in cheese.
To prepare sandwiches, layer turkey slices evenly on toast slices; pour sauce evenly over turkey, and sprinkle evenly with paprika. Top with bacon, and sprinkle with parsley. Serve warm with tomato wedges.