Preheat the oven to 425 degrees F (220 degrees C).

Heat a 10-inch skillet over medium-high heat. Cook and stir ground beef and onion in the hot skillet until beef is browned and crumbly, 5 to 7 minutes. Drain and discard grease.

Stir condensed soup, ketchup, and Worcestershire into the skillet. Spoon beef mixture into a 12x8-inch shallow baking dish. Arrange tater tots around the edge of casserole.

Bake in the preheated oven until tater tots are cooked through, about 25 minutes.