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In this Big Mac Tater Tot casserole, savory ground beef and melted American cheese create a rich base, while Thousand Island dressing and mustard add tangy balance. Crisp potato tots give crunch, and dill pickles, sesame seeds, and iceberg lettuce provide a fresh, briny finish reminiscent of the classic Big Mac.
Gather all ingredients. Preheat the oven to 375 degrees F (190 degrees C).
Cook beef and onion in a 12-inch cast iron skillet over medium heat, stirring often, until beef is no longer pink and onion is softened, 6 to 8 minutes. Remove from heat and let cool slightly, about 15 minutes.
Add Thousand Island dressing, American cheese, mustard, and 1/2 teaspoon salt to beef mixture; stir until combined. Spread mixture evenly in the skillet.
Sprinkle pickles evenly over beef mixture.
Arrange tater tots evenly over the beef mixture; sprinkle evenly with toasted sesame seeds and remaining 1/4 teaspoon salt.
Bake in the preheated oven until tots are crisp, mixture is bubbly, and cheese is melted, 30 to 35 minutes.
Top evenly with iceberg lettuce, drizzle with Thousand Island dressing, and garnish with additional pickles; serve hot.