Step 1

Preheat the oven to 400°F.

Step 2

In a large skillet, heat the olive oil over medium-high heat. Add the chopped onions and cook until softened and lightly browned, about 5 minutes. Add garlic and cook 1 minute more.

Step 3

Add the ground beef to the skillet and season with salt, pepper, garlic powder, and onion powder. Cook, breaking up the meat, until browned and no longer pink, about 7-10 minutes.

Step 4

Transfer the beef mixture to a 9x13 baking dish. Mix in 1/3 cup Thousand Island dressing, 1/3 cup diced pickles, and 1/2 of the shredded cheese.

Step 5

Arrange the tater tots in a single layer on top of the beef. Top with the remaining shredded cheese.

Step 6

Bake uncovered for 25-30 minutes until the tater tots are crispy and golden brown.

Step 7

Remove from the oven and top with shredded lettuce, remaining diced pickles, a drizzle of Thousand Island dressing, and a sprinkle of sesame seeds.

Step 8

Serve hot and enjoy your Big Mac Casserole!