Variation on a hot dog. Kid approved. Experiment and use whatever combo of ingredients you wish.
Preheat an oven to 325 degrees F (165 degrees C).
Stir the hot dogs, Cheddar cheese, relish, ketchup, mustard, and onion together in a bowl; spoon into the hot dog buns. Wrap each sandwich in aluminum foil.
Bake in the preheated oven until hot, about 20 minutes. Serve immediately.
Per Serving: 303 calories; protein 11.8g; carbohydrates 24.1g; fat 17.4g; cholesterol 32.4mg; sodium 880.5mg.