In-N-Out Copycat Animal Style Fries

Crispy fries smothered in melted cheese, caramelized onions, and a tangy special sauce — just like the fast food favorite, made right at home.

Prep Time: 5 minutes
Cook Time: 30 minutes
Total Time: 35 minutes
Servings: 2–3

Ingredients

Special Sauce

• ½ cup mayonnaise
• 2 tbsp ketchup
• ½ tbsp rice vinegar (or white vinegar)
• 2 tbsp sweet relish
• 1 tbsp sugar
• ½ tbsp chili flakes (optional, for heat)

Main Ingredients

• ½ bag frozen fries
• Sliced American cheese or shredded cheddar cheese
• 2 onions, finely diced
• 2 tbsp butter
• 1 tbsp neutral oil (vegetable, canola, etc.)
• ½ tsp salt

Instructions

1. Caramelize the Onions

• In a large skillet over medium-low heat, melt the butter and add the neutral oil.
• Stir in the diced onions and salt.
• Cook slowly for 30+ minutes, stirring every few minutes until deep golden brown.
• Tip: If onions begin to brown too quickly or burn, lower the heat slightly and stir more frequently.

2. Make the Special Sauce

• In a small bowl, mix together mayonnaise, ketchup, vinegar, relish, sugar, and optional chili flakes.
• Stir until fully combined and smooth. Set aside.

3. Prepare the Fries

• Cook frozen fries according to package directions (bake, air fry, or deep fry).
• When hot and crispy, transfer to an oven-safe tray.

4. Assemble & Finish

• While fries are still hot, top with slices of American cheese or shredded cheddar.
• Place under a broiler for 3–5 minutes, or until cheese is melted and bubbly.
• Remove and top with a generous helping of caramelized onions and a drizzle of special sauce.

Notes

• Cheese: In-N-Out uses American cheese, but shredded cheddar works well too — use your favorite.
• Sauce Heat: Chili flakes aren’t part of the traditional recipe but add a great kick if you like spice.
• Onions: Caramelization takes patience — don’t rush! Stir often and keep the heat low.
• Serving Suggestion: Enjoy immediately for the best taste and texture.

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