Begin by slicing the beef franks into bite-sized rounds, ensuring they cook evenly throughout the dish. Grease the crockpot with butter or cooking spray.

In a large mixing bowl, combine the sliced hot dogs with your chosen chili. Gently stir the mixture, ensuring the hot dogs are evenly coated.

Layer half of the tater tots into the greased crockpot, then spoon half of the chili-hot dog mixture over the tater tots, and sprinkle half of the sharp cheddar cheese on top. Repeat with remaining ingredients.

Place the lid on your crockpot and set it to low heat. Cook for 3.5 hours, or up to 4 hours for more tenderness.

Check if the casserole is bubbly and the cheese has melted. For a crispy topping, uncover the crockpot during the last 20-30 minutes.

Scoop portions onto plates or into toasted buns. Top with sour cream and sliced green onions for added freshness.