Animal Style Fries

Featured in: Tasty Sides to Complete Any Meal

This In-N-Out inspired treat layers extra crispy fries with stretchy cheese for the ultimate comfort food. After that, you’ll spoon on caramelized onions cooked low and slow ’til sweet and jammy, then finish it all with a homemade sauce of ketchup, mayo, relish, and vinegar. Want a bit of heat? Sprinkle with chili flakes. Every bite hits all the right notes—crunchy, creamy, tangy, and sweet. It’s hard to stop at just one.
A woman in a kitchen smiling.
By Chloe Chloe
Updated on Thu, 12 Jun 2025 17:44:32 GMT
In-N-Out Style Cheesy Fries Pin it
In-N-Out Style Cheesy Fries | cookitdelish.com

Crunchy fries piled high with melty cheese, sweet browned onions, and zippy house-made sauce come together for an awesome treat you can make right at home. These animal style fries bring that famous burger joint goodness straight to your kitchen, no need to wait in line or keep track of the hours. Crispy potatoes, stretchy cheese, and a mix of tasty toppings all show up for snack time with big flavor and lots of different textures in every bite.

I figured out this copycat during a wild craving while stuck far from my go-to spot. After lots of trial and error, this way always brings back the flavor I remember from California road trips. Now my family asks for these loaded fries for movie marathons and game nights. We kinda like them even more since we get to pick our own portions and turn up (or down) the spice however we want.

Addictive Secret Sauce Details

  • Mayonnaise: This gives your sauce its creamy vibe and holds all the flavor together—full-fat is the best for that classic mouthfeel.
  • Sweet relish: Brings kick and crunch to the mix, lifting the sauce out of boring fry sauce territory. Bitty pickle pieces add brightness and a hint of snap.
  • Vinegar: Cuts the richness and keeps things from getting greasy—a gentler rice vinegar or a punchy hit from white vinegar both work well.

How to Throw This Together

Onion Magic:
In a sturdy pan, let the butter and oil melt over medium-low heat. Toss in your diced onions with some salt and stir 'til they’re coated. Let them go low and slow—give them a stir now and then—so they get really brown and gooey, not burned.
Making the Sauce:
Mix up everything for your sauce in a small dish, making sure that sugar is fully mixed in. Keep whipping it until you see a smooth orangey blend and bits of relish look spread through. Let it chill out at room temp while you get the rest ready.
Getting Fries Crispy:
Lay your frozen fries out on a baking pan with plenty of space so they all crisp up. Bake using what the package says, but add an extra couple minutes at the end so they crisp enough to stay sturdy under all the toppings.
Cheese Time:
Once fries are hot from the oven, lay sliced American or shredded cheddar across the top. Pop back under the broiler, watching close, and pull them when it melts and looks a little bubbly on the sides.
Putting It All Together:
Move the cheesy fries to your dish quick while they’re still steamy. Pile on the caramelized onions nice and even. After that, splash that special sauce all over. Aim for swirls—make sure every bite gets covered.
Easy In-N-Out Copycat Animal Style Fries Pin it
Easy In-N-Out Copycat Animal Style Fries | cookitdelish.com

My brother wasn’t sure homemade could compete until he snacked on these at a family get-together. By his third plate, he had to admit they’re even tastier than what you’d get at the drive-thru, thanks to fresh onions with more snap and flavor. Now he whips them up for every game day and they’re always gone way before halftime, no matter how many he makes.

Fun Ways to Change It Up

This flexible meal can go in tons of directions depending on what you’re into, without losing what makes it awesome. Toss on some bacon bits for smokiness and more crunch. Throw in sliced jalapeños if you’re after a little fire. Try curly or waffle fries for a totally new texture under all that goodness. You could even sprinkle in some blue cheese for funky, bold bites along with your melty usual cheese.

Keeping Leftovers Fresh

These are hands-down best fresh, but your extras can stick around for later snacking. Stash the caramelized onions in the fridge in something air-tight for up to five days—they’ll pick up even more flavor with time. The special sauce gets better after a week in the fridge. For the fries, heat them alone in a hot oven to get back that crisp. Then, just build each portion fresh to keep everything tasty.

Delicious In-N-Out Copycat Animal Style Fries Pin it
Delicious In-N-Out Copycat Animal Style Fries | cookitdelish.com

Frequently Asked Questions

→ Can I make the special sauce ahead of time?
Definitely! You can whip up the sauce up to three days before and stash it in a sealed container in the fridge. The flavors get even better as they sit together.
→ How can I make these Animal Style Fries healthier?
Try using fries that are baked or made in the air fryer instead of frying in oil. Swap in light mayo for the sauce and pile on a little less cheese. Sweet potato fries also work if you want an upgrade.
→ Can I speed up the caramelization process for the onions?
Caramelizing onions needs at least half an hour, but if you’re in a hurry, sprinkle in a bit of baking soda. Don’t jack the heat up though, or your onions could burn before turning sweet.
→ What can I serve with Animal Style Fries?
Pair them up with juicy burgers or your favorite sandwiches. If you want the full In-N-Out vibe, try them next to a Double-Double loaded with lettuce, tomato, and the same special sauce.
→ How can I keep the fries crispy under all those toppings?
Get your fries extra crunchy before you load ’em up. Put on your toppings and eat right away so nothing goes soggy. Thicker fries also stay crispier for longer.

Animal Style Fries

Grab these crispy fries loaded with melted cheese, sweet, brown onions, and a tangy sauce just like In-N-Out’s.

Prep Time
5 Minutes
Cook Time
45 Minutes
Total Time
50 Minutes
By Chloe: Chloe

Category: Side Dishes

Difficulty: Intermediate

Cuisine: American Comfort Classics

Yield: 4 Servings

Dietary: Vegetarian

Ingredients

→ Making the Signature Sauce

01 1/2 tablespoon rice or white vinegar, adds a nice tang
02 2 tablespoons sweet relish
03 1/2 cup rich, creamy mayonnaise
04 2 tablespoons ketchup
05 1 tablespoon sugar to even out the taste
06 1/2 tablespoon chili flakes (optional if you like a little heat)

→ For the Fry Foundation

07 Cheddar or American cheese, melts beautifully
08 1/2 bag frozen fries – grab your go-to brand

→ For the Sweet Onions

09 2 onions, chopped finely
10 1 tablespoon neutral oil (like canola or vegetable)
11 2 tablespoons butter
12 1/2 teaspoon salt

Instructions

Step 01

Pop the butter into a skillet on medium-low, adding the oil once it's melted. Toss in your cut-up onions and sprinkle with salt. Coat everything evenly and stir every so often. Let the onions slowly soften and turn golden. This takes at least 30 minutes (don't rush!). If they're browning too fast, turn the heat down a notch.

Step 02

While the onions are cooking, combine mayo, ketchup, vinegar, relish, sugar, and chili flakes (if using) in a small bowl. Stir well. Let it hang out so the flavors come together.

Step 03

Follow the directions on the package to bake your fries. Get them nice and crispy.

Step 04

When the fries are fresh out of the oven, cover them with grated cheddar or slices of American cheese. Place under the broiler until the cheese bubbles and gets gooey—about 3 to 5 minutes. Keep an eye on it!

Step 05

Take the cheesy fries, top them with your sweet, golden onions, then drizzle the sauce generously all over. Serve up right away while it's all warm and delicious!

Notes

  1. Patience is the trick to getting those onions perfectly golden and sweet—it’s worth it!
  2. Want a bold taste? Swap American cheese for sharp cheddar.
  3. The original sauce skips the chili flakes, but a little heat is a fun twist.

Tools You'll Need

  • Big skillet to cook the onions
  • Baking tray for the fries
  • Small bowl to whip up the sauce

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Includes dairy (cheese, butter)
  • Contains eggs (in the mayo)

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 420
  • Total Fat: 28 g
  • Total Carbohydrate: 35 g
  • Protein: 8 g