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Fairfax Breakfast Sandwich (Eggslut Copycat)

Loaded with caramelized onions, melted cheese, and creamy scrambled eggs all wrapped together in buttery brioche buns, this breakfast sandwich the ultimate way to elevate your morning. This is a copycat recipe of the iconic Eggslut chain and their most popular sandwich, the Fairfax. 
Prep Time5 mins
Cook Time25 mins
Total Time30 mins
Course: Breakfast, Brunch
Cuisine: American
Keyword: breakfast sandwich recipe, brioche, caramelized onions, cheese, copycat recipe, croissant sandwich, eggs, eggslut, scrambled eggs
Servings: 1 sandwich


  • 3 tbsp unsalted butter divided
  • 1 tbsp cooking oil
  • 1 medium yellow onion sliced
  • 1/4 cup water
  • 3 large eggs
  • 2 tbsp chives thinly sliced
  • 2 tbsp mayonnaise
  • 1 tbsp Sriracha
  • 1 brioche bun sliced
  • 1 slice cheddar cheese
  • salt and pepper to taste


To caramelize the onion:

  • In a skillet on medium heat, add cooking oil and sliced onions. Add a pinch of salt and a tablespoon of butter and mix into the onions, spreading them in a single layer. Reduce the heat to low and cook, stirring often, until the onions are soft and lightly golden. Add water to de-glaze the pan, and cook until the onions are fully caramelized. Keep warm.

To scramble the eggs:

  • Add 3 eggs into an unheated skillet, and use a spatula to scramble the eggs until well blended. Add a tablespoon of butter and place the skillet on medium-low heat, stirring continuously to cook. Add a pinch of salt and chives, and cook until the eggs just start to set. Remove from heat and keep warm.

To make the sauce:

  • In a small bowl. combine the Sriracha and mayonnaise in a 1:2 ratio. Mix well.

To assemble:

  • Toast the brioche bun with butter and spread the sriracha mayo on both sides. Top with scrambled eggs. Melt the cheese slightly on a nonstick pan and place it on top of the eggs. Top with 1-2 tablespoons of caramelized onion and enjoy!


For detailed tips and tricks, please refer to the blog post above! 
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