Preheat oven to 350°F
Brown beef over high heat until deeply caramelized. Season with salt, pepper, garlic powder, onion powder, and a pinch of sugar. Drain excess fat
In the same pan, sauté onions until soft and lightly golden. Return beef to pan. Fold in diced pickles and cheese. Mix until melted and cohesive. Let cool slightly before layering
Brush a 9x13 pan generously with butter
Lay down the first sleeve of phyllo sheets and butter each layer or pour about ¾ cup melted butter over the full stack until fully hydrated and glossy
Spread cheeseburger filling evenly and add another layer of cheese
Top with second sleeve of phyllo and repeat the butter process
Using a sharp knife, cut into diamonds before baking. Sprinkle sesame seeds on top
Bake 45–60 minutes until deeply golden and crisp. If browning too fast, tent loosely with foil
Rest at least 15 minutes before serving so the layers set
Serve with burger sauce for dipping
