Caramelized Onion Smash Burgers are juicy and flavorful burgers topped with sweet and savory caramelized onions. The onions are cooked until golden brown and caramelized, adding a rich and delicious flavor to the burgers. The patties are smashed on a hot griddle to create a crispy crust, while keeping the inside juicy and tender. These burgers are perfect for a summer barbecue or a casual weeknight dinner.