Preheat oven to 425°F and bake frozen french fries according to package directions.
Meanwhile, bring a large pot of water to a boil. Add hot dogs and cook for 5-7 minutes until heated through.
Warm the chili in a small saucepan over medium heat, stirring occasionally.
Toast the hot dog buns lightly in the oven for 2-3 minutes if desired.
Set up your hot dog bar with all toppings in separate bowls—chili, cheese, onions, ketchup, mustard, and relish.
Let everyone build their own hot dog masterpiece and serve with crispy fries on the side!