Super Bowl Food: Cheeseburger Filo Squares

Cathy from Noble Pig was craving a Big Mac. Sauce included. But she wanted a lighter version of the real thing and she also wanted it to be more of an appetizer. This recipe is the result. It was fun to make and fun to eat. But is it lighter than a Big Mac? Hmmmm. Not at all sure about that. There's a whole lot of cheese and butter in there! 
The filo crust instead of a bun is genius, no question. And her sauce is fabulous. Maybe better than the real thing. Perfect for Super Bowl snacking, isn't it? The thing is, you do have to serve it right away; it can't sit around waiting. 

Cheeseburger Filo Squares with Copycat Big Mac Sauce
From Cathy at Noble Pig

Ingredients:
7 sheets filo dough, thawed
1/2 cup unsalted butter, melted
1 cup extra sharp cheddar cheese, finely shredded 
1 Tablespoon olive oil
1-3/4 pound ground beef, (85/15 lean)
1 bag (16 oz) shredded iceberg lettuce
1-1/4 cups diced dill pickle
1 cup diced onion
1 Tablespoon sesame seeds
salt and black pepper to taste
12 slices American cheese

Copycat Big Mac Sauce:
1 cup mayonnaise
1/3 cup hamburger relish (it's sweet-found next to the pickle relish)
1/4 cup Thousand Island dressing
1 Tablespoon granulated sugar
1 Tablespoon dried minced onion
1/4 teaspoon black pepper

Method:
Preheat oven to 375 degrees F. Line a baking tray (rimmed 11 x 17 works best) with parchment paper and spray paper with cooking-oil spray. 
Lay 1 sheet filo on paper and brush lightly with a little melted butter. Sprinkle with cheddar cheese. Repeat layering 5 more times (with filo, butter and cheddar), pressing each sheet firmly so it sticks to sheet below. Lay the last filo sheet on top, brush with remaining melted butter, and sprinkle on remaining cheddar cheese. Set aside. 
Heat olive oil in a large nonstick pan over medium-high heat, cook meat until just cooked. Remove from heat and stir in pickle, onion, lettuce and sesame seeds. Season with salt and pepper to your liking. Stir mixture until lettuce wilts and then drain through a sieve. 
Place American cheese slices on top of dough. Leave a little edge. Place meat mixture on top of cheese and bake for 20 minutes until edges are golden brown.
While squares are baking combine all ingredients for the copycat Big Mac Sauce and place in a squeeze bottle.
Once filo is done baking, drizzle with sauce and cut into squares with a pizza cutter. Serve immediately.