5-Ingredient Slow Cooker Mongolian Beef (Easy & Better Than Takeout)

5-Ingredient Slow Cooker Mongolian Beef Recipe

If you’re craving bold, sweet-and-savory flavor with minimal effort, this 5-Ingredient Slow Cooker Mongolian Beef is the perfect weeknight dinner. Tender slices of beef simmer slowly in a rich, garlicky soy sauce glaze that tastes just like your favorite takeout — but made easily at home.

With only five simple ingredients and a crockpot, this recipe is perfect for busy families, meal prep, or anyone looking for an effortless Asian-inspired dinner.

Ingredients (Only 5!)

1½ pounds flank steak, thinly sliced
½ cup low-sodium soy sauce
½ cup brown sugar
3 cloves garlic, minced
2 tablespoons cornstarch

Instructions

Slice flank steak thinly against the grain.
Place beef in the slow cooker.
In a bowl, mix soy sauce, brown sugar, garlic, and cornstarch until combined.
Pour the sauce over the beef and stir gently to coat.
Cover and cook on LOW for 4–5 hours or HIGH for 2–3 hours, until beef is tender and sauce has thickened.
Stir before serving to coat beef in the glossy sauce.

Serve hot over rice or noodles.

Tips for Perfect Mongolian Beef

Slice beef thin for maximum tenderness.
Don’t overcook — flank steak becomes too soft if left too long.
If sauce needs thickening, remove lid during last 30 minutes.
For extra flavor, add sliced green onions before serving (optional, not included in 5 ingredients).

Optional Add-Ins (If You Want More Flavor)

Red pepper flakes for heat
Fresh ginger
Sesame oil
Steamed broccoli
Sliced bell peppers

Serving Suggestions

Steamed white rice
Brown rice
Lo mein noodles
Cauliflower rice for low-carb option

Storage Instructions

Store leftovers in the refrigerator for up to 4 days.
Freeze in airtight containers for up to 2 months.
Reheat gently on stovetop or microwave.

Frequently Asked Questions

Can I use a different cut of beef?

Yes, sirloin works well if sliced thinly.

Is Mongolian beef spicy?

Traditional versions are mild and slightly sweet, but you can add heat if desired.

Can I make this ahead?

Yes, it reheats beautifully and is great for meal prep.

Can I double the recipe?

Absolutely — just ensure your slow cooker isn’t overfilled.