Preheat pan to medium
Brush bread with garlic butter, place face down on pan and smash, flip when it becomes golden, then toast until crispy
Add diced onion and butter to pan on medium and stir until onions caramelize
Season ground beef and separate it into 2 equal pieces
Add to pan on high then smash with parchment paper and spatula
Flip patties and cook until desired then add cheese
Assemble burger by adding bun, sauce, patty, patty, onions, sauce, and top bun in order
Enjoy
