In a small bowl, stir together the sauce ingredients and allow them to mellow while assembling the casserole.
½ cup Mayonaise, 3 Tablespoons Sweet Pickle Relish, 1 Tablespoon Yellow Onion, 1 ½ teaspoons Mustard, 1 Tablespoon Ketchup, ½ teaspoon Paprika, ½ teaspoon Onion Powder, ¼ teaspoon Salt
In a large skillet, cook the ground beef, salt, pepper, garlic powder, and chopped onions over medium-high heat. Cook until the burger starts to brown and get slightly crispy.
¼ teaspoon Garlic Powder, 2 pounds Ground Beef, Salt and Pepper, ½ teaspoon Garlic Powder, ½ cup Chopped Onion
When ground beef is browned and onions are tender, stir in the cheese soup and ½ cup Big Mac Sauce. Spread in the bottom of a 9x13 baking pan.
1 can Cheese Soup
Top ground beef mixture with cheese slices.
6 slices American Cheese
Spread tater tots over the cheese slices and sprinkle tots with Lawry's Seasoning Salt. Bake at 425 degrees F for 30-35 mintues or until tots are nicely browned.
32 ounces Frozen Tater Tots, 1 teaspoon Lawry's Seasoning Salt
Top golden brown tater tots with chopped lettuce, dill pickle slices, remaining chopped onions, remaining Big Mac Sauce, and sprinkle with sesame seeds. Serve immediately.