Place a large nonstick skillet coated with cooking spray over medium heat. Add hot dogs, and cook until evenly browned, turning frequently. 2. Pour chili into a small saucepan; cook over medium heat until bubbly.
Pour chili into a small saucepan; cook over medium heat until bubbly.
Spread 1 teaspoon mustard over inside of each hot dog bun. Place hot dogs in buns; spoon chili evenly over each hot dog. Sprinkle 1 tablespoon onion and 2 tablespoons cheese over each hot dog.