Mongolian Beef Slow Cooker

Featured in Beef.

Whipped up Mongolian beef in the slow cooker yesterday—seriously easy and so good. Tossed it all in before leaving, came back to the best aroma! The beef turned buttery-soft and just broke apart. The sauce thickened into a sticky-sweet deliciousness like your fav takeout spot. Even my picky kids couldn’t stop eating. Added extra for rice. Can’t wait to make this again for Chinese night at home.
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Updated on Thu, 03 Apr 2025 00:24:42 GMT
Tender beef slices in a glossy savory-sweet sauce, topped with sesame seeds and green onions, served on white rice. Pin it
Tender beef slices in a glossy savory-sweet sauce, topped with sesame seeds and green onions, served on white rice. | tasteofmoms.com

Simple Crock Pot Mongolian Beef

This crock pot Mongolian beef turns ordinary flank steak into something truly wonderful. The beef gets incredibly soft, almost dissolving when you take a bite, while the rich blend of garlic and soy creates an irresistible sauce. I'm a big fan of letting my crock pot handle everything, bringing this takeout classic straight to my dinner table.

What Makes This Mongolian Beef Foolproof

The great thing about this crock pot Mongolian beef is how little effort it needs while delivering something that tastes just like takeout. Slow cooking makes the beef unbelievably soft while building those deep sweet-savory flavors. It's just what you need on hectic days when you want a knockout meal without spending hours in the kitchen.

Your Ingredients List

  • Flank Steak: Cut it thinly across the grain for extra tenderness.
  • Cornstarch: Gives you that wonderful consistency everybody craves.
  • Soy Sauce: The foundation of our delicious sauce.
  • Brown Sugar: Brings that perfect touch of sweetness.
  • Carrots: They offer a lovely natural sweet flavor.
  • Garlic: Boosts the taste of everything else.

Preparation Steps

Prep Your Meat
Cut it into thin slices then coat thoroughly with cornstarch.
Create Your Sauce
Combine that delicious mixture of soy sauce garlic and brown sugar.
Load The Crock Pot
Put in your beef and carrots then drizzle that tasty sauce over everything.
Set And Forget
Now just let your crock pot do its thing for several hours.
Ready To Eat
Scoop it onto steaming rice sprinkle with green onions and sesame seeds.

My Cooking Tips

Don't forget to slice your beef opposite the grain since it really helps with softness. Want more veggies? Throw in some broccoli or bell peppers right before it's done. Got an Instant Pot handy? This works wonderfully there too just brown the meat first. Any leftover portions taste fantastic and can be frozen easily for quick future meals.

A close-up view of a slow cooker filled with tender beef strips, carrots, and green onions in a glossy brown sauce, with a wooden spoon ready to serve. Pin it
A close-up view of a slow cooker filled with tender beef strips, carrots, and green onions in a glossy brown sauce, with a wooden spoon ready to serve. | tasteofmoms.com

Frequently Asked Questions

→ What does cornstarch do for the beef?
It makes the meat softer and also thickens the sauce while everything cooks.
→ Can I swap the beef for another cut?
Flank steak works great, but thinly sliced sirloin or chuck steak can do the trick too.
→ Is the dish really sweet?
The sweetness from brown sugar balances the soy sauce. You can use less sugar if you want it less sweet.
→ Are extra veggies okay to add?
Totally! Try bell peppers or broccoli, but put them in during the last hour so they don’t get mushy.
→ Why use grated carrots?
They dissolve into the sauce, adding natural sweetness and a bit of nutrition without feeling chunky.

Mongolian Beef Slow Cooker

Flank steak cooks low and slow in a flavorful sweet-savory sauce that’s easy to make. It’s the perfect cozy meal, better than takeout.

Prep Time
10 Minutes
Cook Time
240 Minutes
Total Time
250 Minutes
By: Ashley

Category: Beef

Difficulty: Easy

Cuisine: Asian-American

Yield: 6 Servings (1 pot)

Dietary: Dairy-Free

Ingredients

01 1 cup grated carrots.
02 1½ pounds of flank steak.
03 3/4 cup water.
04 1/4 cup of cornstarch.
05 2 tablespoons of olive oil.
06 1 teaspoon minced garlic.
07 3/4 cup of soy sauce.
08 3/4 cup of brown sugar.
09 Sesame seeds for topping.
10 Chopped green onions for garnish.

Instructions

Step 01

Slice the flank steak nice and thin.

Step 02

Toss the sliced steak in cornstarch using a zip-top bag.

Step 03

Whisk together garlic, oil, soy sauce, water, and sugar until blended.

Step 04

Dump the sauce into the slow cooker.

Step 05

Put the grated carrots and steak into the cooker.

Step 06

Mix so the meat is completely covered with the sauce.

Step 07

Set it to cook on high for 2–3 hours or low for 4–5 hours.

Step 08

Spoon it over rice before serving.

Step 09

Sprinkle sesame seeds and green onions on top to finish.

Notes

  1. Slice the steak opposite the grain.
  2. If sliced thin, other beef cuts work too.
  3. Add any additional veggies during the last hour.
  4. Feel free to reduce the sugar level to suit your taste.

Tools You'll Need

  • A slow cooker.
  • A resealable plastic bag.

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Contains soy from soy sauce.
  • Regular soy sauce contains wheat.

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 348
  • Total Fat: 10 g
  • Total Carbohydrate: 36 g
  • Protein: 28 g