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Preheat a large griddle or cast-iron pan over medium-high heat. Add the diced bacon and cook, stirring frequently, until crispy and browned. This should take about 8-10 minutes. Remove the cooked bacon with a slotted spoon, reserving about 1 tablespoon of bacon grease on the griddle.

While the bacon cooks, prepare the Baconnaise sauce. In a medium mixing bowl, combine the mayonnaise, Worcestershire sauce, apple cider vinegar, ketchup, and yellow mustard. Once the bacon is cooked and cooled slightly, add the crispy bacon bits to the sauce mixture. Mix thoroughly until all ingredients are well combined, forming a thick, creamy sauce with visible bacon pieces.

Add the thinly sliced onions to the griddle with the reserved bacon grease. Season with salt. Cook, stirring occasionally, until the onions are soft, translucent, and caramelized to a golden-brown color. This will take approximately 10-12 minutes. Remove the caramelized onions from the griddle and set aside.

Increase the griddle heat to medium-high if needed. Place the rectangular ground beef patties onto the hot griddle. Cook for 3-4 minutes per side, pressing down gently with a spatula to flatten them and create a nice crust. Cook to your desired doneness.

Once the patties are flipped, immediately place one slice of American cheese on top of each beef patty on the griddle. Allow the cheese to melt over the patties, which should take about 1-2 minutes.

While the cheese melts, place the slices of thick-cut sourdough bread onto the griddle, using any remaining bacon grease or adding a small amount of butter if desired. Toast the bread until golden brown on both sides, about 2-3 minutes per side.

To assemble each patty melt: Place one slice of toasted bread on a serving plate. Top with a beef patty with melted cheese. Spoon a generous amount of the prepared Baconnaise sauce over the melted cheese and beef patty. Using tongs, add a large portion of the caramelized onions on top of the Baconnaise sauce. Place a second toasted slice of bread on top to complete the sandwich. Gently press down on the assembled sandwich and cut in half before serving.


Preheat a large griddle or cast-iron pan over medium-high heat. Add the diced bacon and cook, stirring frequently, until crispy and browned. This should take about 8-10 minutes. Remove the cooked bacon with a slotted spoon, reserving about 1 tablespoon of bacon grease on the griddle.

While the bacon cooks, prepare the Baconnaise sauce. In a medium mixing bowl, combine the mayonnaise, Worcestershire sauce, apple cider vinegar, ketchup, and yellow mustard. Once the bacon is cooked and cooled slightly, add the crispy bacon bits to the sauce mixture. Mix thoroughly until all ingredients are well combined, forming a thick, creamy sauce with visible bacon pieces.

Add the thinly sliced onions to the griddle with the reserved bacon grease. Season with salt. Cook, stirring occasionally, until the onions are soft, translucent, and caramelized to a golden-brown color. This will take approximately 10-12 minutes. Remove the caramelized onions from the griddle and set aside.

Increase the griddle heat to medium-high if needed. Place the rectangular ground beef patties onto the hot griddle. Cook for 3-4 minutes per side, pressing down gently with a spatula to flatten them and create a nice crust. Cook to your desired doneness.

Once the patties are flipped, immediately place one slice of American cheese on top of each beef patty on the griddle. Allow the cheese to melt over the patties, which should take about 1-2 minutes.

While the cheese melts, place the slices of thick-cut sourdough bread onto the griddle, using any remaining bacon grease or adding a small amount of butter if desired. Toast the bread until golden brown on both sides, about 2-3 minutes per side.

To assemble each patty melt: Place one slice of toasted bread on a serving plate. Top with a beef patty with melted cheese. Spoon a generous amount of the prepared Baconnaise sauce over the melted cheese and beef patty. Using tongs, add a large portion of the caramelized onions on top of the Baconnaise sauce. Place a second toasted slice of bread on top to complete the sandwich. Gently press down on the assembled sandwich and cut in half before serving.
