Description
Crispy fries smothered in melted cheese, caramelized onions, and a tangy special sauce — just like the fast food favorite, made right at home.
Ingredients
Special Sauce
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½ cup mayonnaise
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2 tbsp ketchup
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½ tbsp rice vinegar (or white vinegar)
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2 tbsp sweet relish
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1 tbsp sugar
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½ tbsp chili flakes (optional, for heat)
Main Ingredients
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½ bag frozen fries
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Sliced American cheese or shredded cheddar cheese
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2 onions, finely diced
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2 tbsp butter
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1 tbsp neutral oil (vegetable, canola, etc.)
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½ tsp salt
Instructions
1. Caramelize the Onions
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In a large skillet over medium-low heat, melt the butter and add the neutral oil.
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Stir in the diced onions and salt.
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Cook slowly for 30+ minutes, stirring every few minutes until deep golden brown.
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Tip: If onions begin to brown too quickly or burn, lower the heat slightly and stir more frequently.
2. Make the Special Sauce
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In a small bowl, mix together mayonnaise, ketchup, vinegar, relish, sugar, and optional chili flakes.
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Stir until fully combined and smooth. Set aside.
3. Prepare the Fries
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Cook frozen fries according to package directions (bake, air fry, or deep fry).
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When hot and crispy, transfer to an oven-safe tray.
4. Assemble & Finish
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While fries are still hot, top with slices of American cheese or shredded cheddar.
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Place under a broiler for 3–5 minutes, or until cheese is melted and bubbly.
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Remove and top with a generous helping of caramelized onions and a drizzle of special sauce.
Notes
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Cheese: In-N-Out uses American cheese, but shredded cheddar works well too — use your favorite.
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Sauce Heat: Chili flakes aren’t part of the traditional recipe but add a great kick if you like spice.
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Onions: Caramelization takes patience — don’t rush! Stir often and keep the heat low.
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Serving Suggestion: Enjoy immediately for the best taste and texture.