Drape a square of puff pastry over a small bowl. Place one cooked beef patty in the center and top with a slice of cheddar cheese.
Add a dollop of burger sauce, pickle slices, and a spoonful of caramelized onions on top of the cheese.
Place a second cooked beef patty on top, followed by another slice of cheese. Fold the overlapping edges of the puff pastry into the center and pinch them together to completely seal the burger.
Invert the wrapped burgers onto a baking tray so the seam side is down. Brush the tops with beaten egg wash and sprinkle generously with sesame seeds.
Bake in a preheated oven until the pastry is golden brown, puffed up, and crispy. Serve immediately with fries.
Cook it hands-free.
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