01 -
Preheat oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish. Cook the sliced hot dogs and diced onion in a large dry skillet over medium heat for about 5 minutes, stirring occasionally, until the onions soften and the hot dogs brown slightly. Transfer to the prepared dish and spread into an even layer.
02 -
In a mixing bowl, whisk together the condensed soup, milk, mustard, garlic powder, salt, and pepper until smooth. Pour evenly over the hot dog mixture. Scatter 1 cup of the shredded cheddar on top.
03 -
Arrange the frozen tater tots in a single layer over the cheese, covering the surface edge to edge without stacking.
04 -
Bake uncovered for 30 minutes. Remove from the oven, sprinkle the remaining 1/2 cup of cheddar over the tots, and bake 5 minutes more until the cheese is fully melted and the edges are bubbling. Let rest 5 minutes before serving.