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Cast Iron Patty Melt

Prep Time10 mins
Cook Time30 mins
Total Time40 mins
Course: Main Course
Cuisine: American
Servings: 4
Author: Stacey Little | Southern Bite


  • 2 large sweet onions, peeled, halved, and thinly sliced
  • 8 tablespoons unsalted butter, divided
  • 1/3 cup mayonnaise
  • 2 tablespoons ketchup
  • 1/2 teaspoon yellow mustard
  • 1/4 teaspoon garlic powder
  • 1/4 teaspoon ground black pepper
  • 4 Chop House by Holten Angus Sirloin Steak Burgers
  • 8 slices thick cut sourdough or rye bread
  • 4 slices medium cheddar cheese
  • 4 slices swiss cheese


  • In a large skillet, melt 2 tablespoons of butter over medium-low heat.  Add the onions and cook over low heat, stirring occasionally, until they are golden and soft - about 30 minutes.  
  • Make the sauce by combining the mayonnaise, ketchup, mustard, garlic powder, and black pepper.  Set aside.  
  • Heat a large cast iron skillet over medium-high heat.  Add two tablespoons of butter then cook the burger patties according to the package instructions.  Wipe the skillet clean.    
  • Assemble each sandwich by spreading the sauce on one side of all 8 slices of bread.  Divide the onions between 4 slices of bread.  Top each with a burger patty, one slice of each cheese, and then another slice of bread.  
  • Add 2 tablespoons of butter to a skillet over medium-low heat.  Swirl to coat the pan with the melted butter.  Add the assembled sandwiches and cook until the bread is golden brown.  Flip the sandwiches and add the remaining 2 tablespoons of butter.  Move the sandwiches around to coat them in butter.  Cook until golden brown.  Serve immediately.