Slow Cooker Mongolian Beef

This Slow Cooker Mongolian Beef is one of those dinners that feels fancy but couldn’t be easier to make. With tender slices of flank steak simmered in a rich, savory-sweet sauce, it’s a recipe the whole family will love. The best part? It takes just 10 minutes of prep, then your slow cooker does the rest. Pair it with rice or crispy sides for a dinner everyone will want seconds of!

And here’s a little mom tip: this dish pairs beautifully with quick sides like crispy Air Fryer Sweet Potato Fries or Air Fryer Roasted Carrots. Dinner goes from “just getting it on the table” to a mini celebration with very little effort.

So, grab your slow cooker and let’s make dinner time a whole lot easier (and tastier).

crockpot slow cooker Mongolian Beef in bowl with rice

Ingredients You’ll Need

Here’s what you’ll need to make your slow cooker Mongolian beef. I’ll also share a few tips and swaps in case you don’t have everything on hand.

Ingredients You’ll Need

  • 1 lb flank steak – Thinly sliced against the grain for tenderness.
  • 3 garlic cloves – Freshly minced for maximum flavor.
  • 1-inch piece of ginger – Grated or finely minced. (Pro tip: freeze ginger and use a microplane grater no peeling needed.)
  • 1 scallion (green onion) – For that fresh garnish at the end.
  • ½ cup reduced salt soy sauce – Keeps it flavorful without being too salty.
  • ⅓ cup brown sugar – Adds the perfect touch of sweetness.
  • ¼ cup cornstarch – Helps thicken the sauce and gives the beef that signature coating.
  • ¼ cup water – Blends into the sauce.
  • 2 tbsp vegetable oil – To keep things from sticking at the bottom of the slow cooker.
  • 1 tbsp sesame oil – For that nutty, authentic flavor.
  • 1 tbsp sesame seeds – A pretty garnish with a little crunch.
  • Salt & black pepper, to taste – Always season to your liking.
ingredients to make slow cooer Mongolian beef

Step-by-Step Instructions

I know recipes can sometimes feel intimidating, but this one is really straightforward. Here’s exactly how to make it:

  • Prep the Beef
    Thinly slice your flank steak against the grain this helps the meat stay tender, even after hours in the slow cooker. Once sliced, dice it into smaller bite-sized pieces.
cut beef into strips and chunks
  • Season & Coat
    Place the steak in a bowl, season lightly with salt and black pepper, and toss with cornstarch until every piece is coated. This step not only thickens the sauce later but also gives the beef that silky texture you’ll recognize from restaurant-style dishes.
season beef then coat in cornstarch
  • Mince Garlic & Ginger
    Fresh garlic and ginger are key here. Mince or grate them finely so they blend into the sauce.
add spices
  • Layer in the Slow Cooker
    Drizzle the vegetable oil in first to prevent sticking. Add your steak pieces, then sprinkle in the garlic and ginger.
  • Add the Sauce Ingredients
    Pour in the soy sauce, brown sugar, sesame oil, and water. Stir gently to combine everything together.
add the rest of ingredients
  • Cook Low & Slow
    Cover and cook on high for 2.5 hours or low for 4–5 hours. Either way, your house is going to smell absolutely amazing.
  • Finish & Serve
    Once cooked, stir well and check the sauce it should be glossy and cling beautifully to the beef. Slice your scallion and sprinkle it on top, along with a handful of sesame seeds.
  • Enjoy!
    Serve over a bed of steamed rice, noodles, or even cauliflower rice if you’re going for a lighter option.
Bowl of slow cooked Mongolian beef and rice

Why You’ll Love This Recipe

There are a few recipes that become instant family staples, and this one is definitely in that category. Here’s why:

  • Minimal Prep Time: You only need 10 minutes to slice, season, and toss everything in the slow cooker.
  • Family-Friendly Flavors: Sweet, garlicky, and just the right amount of savory kids and adults both love it.
  • Budget-Friendly: Flank steak stretches a long way, especially when paired with rice or noodles.
  • Perfect for Parties: Need something you can make ahead for guests? This dish stays warm in the slow cooker until you’re ready to serve.
  • Better Than Takeout: It has all the flavors you love from your favorite Chinese takeout spot, but made right at home (and for way less money).

Tips for Success

  • Slice the Beef Thinly: This makes all the difference. Thinner slices = more tender beef.
  • Don’t Skip the Cornstarch: It thickens the sauce and keeps it from being watery.
  • Adjust the Sweetness: If you like it less sweet, reduce the brown sugar to ¼ cup.
  • Make It Spicy: Add a teaspoon of red pepper flakes or a squirt of sriracha if your family likes a little heat.
  • Double the Recipe: Feeding a crowd? This recipe doubles easily just make sure your slow cooker can handle it.

Storing & Reheating

Got leftovers? Lucky you.

  • Store: Keep in an airtight container in the fridge for up to 4 days.
  • Freeze: Freeze portions for up to 3 months perfect for a future “don’t want to cook” day.
  • Reheat: Warm gently in the microwave or on the stovetop with a splash of water to loosen the sauce.

Variations to Try

Once you’ve made this once (and loved it), you might want to play around with it. Here are some fun ideas:

  • Add Veggies: Toss in sliced bell peppers, carrots, or broccoli during the last hour of cooking.
  • Make It Lighter: Use chicken breast instead of beef for a leaner version.
  • Gluten-Free: Swap soy sauce for tamari.
  • Low-Sugar: Replace brown sugar with honey or a sugar substitute.

Why This Recipe Works for Families

As a mom, I know how chaotic evenings can be. Between sports practices, homework battles, and the never-ending pile of laundry, dinner sometimes feels like the last straw. That’s why I lean on recipes like this one.

It’s not just about putting food on the table it’s about gathering everyone together, even if only for 20 minutes, to share a meal that feels homemade without making me feel like I’ve run a marathon in the kitchen.

Plus, when you have a recipe that the whole family enjoys, it cuts down on the “But I don’t like that!” dinner table drama. And that, in my book, is worth its weight in gold.

If you’ve been searching for a recipe that’s easy, delicious, and guaranteed to please a crowd, this Slow Cooker Mongolian Beef is the one to try. It’s the kind of dish that makes you feel like you’ve pulled off a small miracle dinner that tastes restaurant-quality, with minimal effort.

Whether you’re serving it up on a busy weeknight, or making it for friends on the weekend, this recipe will quickly earn a permanent spot in your meal rotation.

So next time you’re staring at your fridge wondering what to make, remember this: 10 minutes of prep, a few hours in the slow cooker, and you’ll have a cozy, flavorful dinner that brings everyone to the table.

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