These In-N-Out Animal Style Fries are my copycat of the secret-menu order: crispy fries topped with melted American cheese, caramelized onions, and a tangy pink sauce. I bake frozen fries on a sheet pan instead of deep frying, cook the onions in butter with a little brown sugar while they bake, and whisk the sauce together from mayo, ketchup, sweet relish, lemon juice, and a teaspoon of sugar. It takes about 35 minutes and serves 4.
Making a fast food favorite at home is fun, and these are for anyone who loves In-N-Out’s secret menu or just wants loaded fries with plenty of sauce and cheese. This version skips deep frying and starts with frozen French fries baked on a sheet pan, plus caramelized onions, melted cheese, and a creamy, tangy sauce that comes together while the fries are in the oven.
I make these for game days, late-night snacks, or sharing with friends, and the recipe scales easily from a small plate to a big tray. You still get crisp fries, soft onions, and a rich sauce without standing over hot oil, so it works on busy nights when you want something comforting without a lot of work. If you like these, my Loaded Tater Tots and Halloumi Fries are two more snacks to try.
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💛 Why you’ll love this recipe
- Ready in about 35 minutes.
- No deep frying or special tools needed.
- Made with frozen fries and everyday ingredients.
- The sauce has the classic tangy flavor of the In-N-Out original.
➡️ Ingredients you’ll need
⏲ How to make this animal style fries recipe
👉 Easy ingredient swaps
- American Cheese: Use shredded cheddar instead and sprinkle it over the hot fries before broiling for 1-2 minutes.
- Sauce: Add a dash of hot sauce or paprika for extra heat.
- Cheese Sauce: Melt Velveeta in the microwave and spoon it over the hot fries before adding onions and sauce.
✨ Variations
- Loaded: Add crumbled bacon and/or chopped pickles.
- Spicy: Use pepper jack cheese and a little sriracha in the sauce.
- Air Fryer: Cook the fries in the air fryer according to the package directions, then assemble as written.
〰️ How to serve
- Burgers or sandwiches: Serve alongside grilled burgers, pulled chicken sandwiches, or hot dogs.
- Game day snacks: Set out a tray during football games or parties.
💬 FAQs
Do animal fries keep well?
Not really. They soften quickly, so it’s best to make only what you’ll eat right away. You can easily use half a bag
of fries and save the rest for later.
How should I store leftovers?
Store the leftover onions and the sauce separately in airtight containers in the fridge for up to 4 days. Bake a fresh batch of fries when you’re ready for another serving.
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In-N-Out Animal Style Fries
Ingredients
Fries
- 24 ounces frozen French fries, thin cut or shoe string
- 4 slices American cheese
Onions
- 2 Tablespoons salted butter
- 1 small yellow onion, finely diced
- 1 teaspoon brown sugar
Sauce
- ½ cup mayo
- 3 Tablespoons ketchup
- 2 Tablespoons sweet relish
- 1 teaspoon lemon juice or vinegar
- 1 teaspoon white sugar
Instructions
- Bake Fries: Bake 24 ounces frozen French fries on a baking sheet according to the package directions. (For easy cleanup, bake them on a lightly sprayed piece of foil or parchment paper.)
- Caramelize Onions: While fries bake, heat a medium skillet over medium heat and melt 2 Tablespoons salted butter. Add diced onion and cook for about 10-15 minutes until soft. Stir in 1 teaspoon brown sugar and cook another 5 minutes, then remove from heat.
- Make Sauce: Whisk ½ cup mayo, 3 Tablespoons ketchup, 2 Tablespoons sweet relish, 1 teaspoon lemon juice or vinegar, and 1 teaspoon white sugar together in a small bowl.
- Melt Cheese: Once fries are crisp, remove baking sheet from the oven. Turn the oven to a low broil. Push fries into a pile in the center of baking sheet and lay 4 slices American cheese on top in a single layer. Broil 2-3 minutes until melted, watching closely.
- Assemble: Top cheese-covered fries with caramelized onions and drizzle with some of the sauce, saving the rest for dipping.
- Serve: Serve immediately with extra sauce for dipping.
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