Easy Slow Cooker Mongolian Beef

Easy slow cooker mongolian beef delivers restaurant-quality flavor in under 3 hours. Burnt sugar and soy glaze turn tender beef into a craveable dish. After making this many times, I know the secret to perfect texture. Crispy edges and juicy meat make every bite irresistible. Try it with my garlic herb roasted cauliflower steaks for a complete meal. If you love recipes like this, you’ll also enjoy Garlic Herb Roasted Cauliflower Steaks and Spring Lemon Chicken Orzo Soup.

What You'll Need for Easy Slow Cooker Mongolian Beef

Choosing the right ingredients makes a big difference, but this recipe is forgiving enough to work with what you have.

• 1 lb beef sirloin, sliced thin
• 1/2 cup soy sauce
• 1/4 cup oyster sauce
• 2 tbsp brown sugar
• 2 cloves garlic, minced
• 1 tbsp ginger, grated
• 1 tbsp cornstarch
• 1 tbsp vegetable oil
• 1/4 cup water
• Garlic and ginger base
• Soy and oyster sauce balance
• Brown sugar adds depth
• Cornstarch thickens sauce
• Optional: Sesame seeds
• Optional: Chopped green onions
• Optional: Crispy noodles

How to Make Easy Slow Cooker Mongolian Beef

1. Step 1: In a bowl, mix soy sauce, oyster sauce, brown sugar, garlic, ginger, and cornstarch.
2. Step 2: Add beef slices and toss to coat. Let sit for 15 minutes.
3. Step 3: Heat oil in a skillet over medium-high heat. Cook beef in batches until browned. Transfer to a slow cooker.
4. Step 4: Pour in water and sauce. Cook on low for 6-8 hours or high for 3-4 hours.
5. Step 5: Stir in 1 tbsp cornstarch mixed with 2 tbsp water. Cook 10 minutes until thickened.

Storing & Reheating Easy Slow Cooker Mongolian Beef

Short-Term Storage

Store in an airtight container in the fridge. 3 days Make-ahead tip: Prepare sauce and marinate beef up to 24 hours in advance

Freezing Easy Slow Cooker Mongolian Beef

2 months

How to Reheat Without Drying It Out

Oven: 350°F for 15 minutes Microwave: 1-2 minutes on high

Recipe Notes

• Chef tip: Use a non-stick skillet to avoid burning the beef.
• Best substitution: Use hoisin sauce instead of oyster sauce for a vegetarian version.
• Make-ahead: Make the sauce and marinate the beef the night before.
• Scaling: Double the recipe for a large group, using a larger slow cooker.
• Troubleshooting: If sauce is too sweet, add a splash of vinegar or soy sauce to balance.

Easy Slow Cooker Mongolian Beef

⏱

Prep

15 min

🍳

Cook

6-8 hr

⏳

Total

6 hr 15 min

🍽

Serves

4 servings

Ingredients

Main Ingredients

• 1 lb beef sirloin, sliced thin
• 1/2 cup soy sauce
• 1/4 cup oyster sauce
• 2 tbsp brown sugar
• 2 cloves garlic, minced
• 1 tbsp ginger, grated
• 1 tbsp cornstarch
• 1 tbsp vegetable oil
• 1/4 cup water

Seasonings

• Garlic and ginger base
• Soy and oyster sauce balance
• Brown sugar adds depth
• Cornstarch thickens sauce

Optional Toppings

• Sesame seeds
• Chopped green onions
• Crispy noodles

Instructions

1. Step 1: In a bowl, mix soy sauce, oyster sauce, brown sugar, garlic, ginger, and cornstarch.
2. Step 2: Add beef slices and toss to coat. Let sit for 15 minutes.
3. Step 3: Heat oil in a skillet over medium-high heat. Cook beef in batches until browned. Transfer to a slow cooker.
4. Step 4: Pour in water and sauce. Cook on low for 6-8 hours or high for 3-4 hours.
5. Step 5: Stir in 1 tbsp cornstarch mixed with 2 tbsp water. Cook 10 minutes until thickened.

Notes

• Chef tip: Use a non-stick skillet to avoid burning the beef.
• Best substitution: Use hoisin sauce instead of oyster sauce for a vegetarian version.
• Make-ahead: Make the sauce and marinate the beef the night before.
• Scaling: Double the recipe for a large group, using a larger slow cooker.
• Troubleshooting: If sauce is too sweet, add a splash of vinegar or soy sauce to balance.

Storage

• Fridge: 3 days
• Freezer: 2 months
• Oven reheat: 350°F for 15 minutes
• Microwave reheat: 1-2 minutes on high
• Make ahead: Prepare sauce and marinate beef up to 24 hours in advance

Nutrition Per Serving

• Calories: 350
• Protein: 25g
• Fat: 15g
• Carbs: 10g
• Fiber: 1g
• Sugar: 10g
• Sodium: 800mg
• Cholesterol: 80mg
• Sat. Fat: 5g

Nutritional values are estimates only. Actual values may vary by brand and portion size.

Easy Slow Cooker Mongolian Beef FAQs

A Warm Final Note

I can’t wait for you to try Easy Slow Cooker Mongolian Beef and see how effortlessly it comes together. When you make it, pop back here and leave a rating or share how it turned out — I love hearing from you!