Preheat oven to 300°F. Wrap hot dog buns in foil.
8 hot dog buns
Brown the ground beef with half of the chopped onions in a large skillet over medium-high heat, breaking it up as it cooks until no longer pink and the onion has softened, about 5 minutes.
1 lb ground beef, 1 large yellow onion
Add in the chili powder, cumin, salt, pepper, garlic powder, and celery salt. Cook for another 3 minutes, stirring occasionally.
2 Tablespoons chili powder, 1 Tablespoon cumin, 1 teaspoon kosher salt, 1/2 teaspoon garlic powder, 1/2 teaspoon celery salt, 1/2 teaspoon black pepper
Add tomato sauce, water, mustard, and Worcestershire sauce. Once the mixture comes to a boil, reduce the heat to low and simmer for 20 minutes until thickened. Add additional water, if needed, if the mixture becomes too thick.
8 oz tomato sauce, 1/4 cup water, 1 Tablespoon yellow mustard + more for topping, 1 Tablespoon Worcestershire sauce
While the sauce simmers, wrap the hot dog buns in foil and place them in the oven to heat through for about 10 minutes.
Bring a large pot of water to a boil. Add the hot dogs and cook for 5-7 minutes until heated through.
8 hot dogs
To assemble, place a hot dog in each on the warmed buns and top with the chili. Sprinkle shredded cheese and finely diced onion on top, then finish with a squirt of yellow mustard. Serve immediately.
Shredded cheese, Finely diced onion, Yellow mustard