Easy Crockpot Kung Pao Beef for Busy Weeknights Tips, FAQ & printable recipe

Tips for success

For a more intense flavor, marinate the sliced flank steak in a small portion of the Kung Pao sauce for 30 minutes in the refrigerator before layering it in the slow cooker.

This short marination step allows the flavors to penetrate the meat deeply, resulting in a more savory finished product. Always keep the meat in the refrigerator during this process to ensure it stays at a safe temperature before cooking.

If you prefer a thicker sauce, you can stir in a teaspoon of cornstarch mixed with a tablespoon of cold water during the final 30 minutes of cooking.

This simple adjustment will give the sauce a restaurant-quality viscosity that clings perfectly to the beef and peppers. Ensure you whisk the cornstarch slurry thoroughly before adding it to avoid any lumps, and stir gently to incorporate it into the cooking liquid.

Variations

• Vegetable Medley: Add snap peas, water chestnuts, and sliced carrots to the slow cooker along with the bell peppers for extra crunch and a wider variety of textures in every bite.
• Extra Spicy: Increase the amount of crushed red pepper flakes to two teaspoons and add a tablespoon of chili garlic sauce to the mixture before cooking for a significantly bolder, spicier flavor.

Storage and make-ahead

Fridge

Store in an airtight container in the refrigerator for up to 3 days.

Freezer

Freeze in a freezer-safe container for up to 2 months. Thaw in the refrigerator overnight before reheating.

Reheat

Reheat gently in a saucepan over medium-low heat or in the microwave until heated through, stirring occasionally to ensure even temperature.

Transfer any leftovers to an airtight container. Allow the dish to cool at room temperature for no more than two hours before placing it into the refrigerator. Properly stored, the Kung Pao beef will remain flavorful and safe to eat for up to three days when kept in the refrigerator, allowing for an easy meal during the busy work week.

This recipe is excellent for make-ahead meal planning. You can prepare the steak and peppers in advance and store them in the refrigerator, ready to be placed in the slow cooker when needed.

The sauce can also be prepared or portioned out ahead of time. Simply combine all ingredients in the slow cooker insert when you are ready to start the cooking cycle, saving valuable time during your morning routine.

Serving ideas

Serve this Kung Pao beef hot over a bed of freshly steamed white or brown rice to soak up the savory sauce. The rice provides a neutral base that perfectly complements the bold, spicy, and salty flavors of the beef and peppers. For a complete meal, consider adding a side of steamed broccoli or baby bok choy, which pairs beautifully with the Asian-inspired profile of the main dish.

The addition of roasted peanuts is crucial for the authentic Kung Pao experience. They provide a satisfying crunch that contrasts with the tender beef and soft peppers.

If you enjoy extra heat, feel free to add a few whole dried red chilies or a drizzle of chili oil at the table. Ensure the peanuts are added just before serving to maintain their texture and prevent them from becoming soft in the sauce.

Frequently asked questions

Recipe card

Easy Crockpot Kung Pao Beef for Busy Weeknights

Prep 10 minCook 4 hRest 5 minTotal 4 h 15 minServes 4

Ingredients

• 1 lb flank steak, sliced into thin strips
• 2 cups green bell peppers, chopped
• 1 tsp crushed red pepper flakes
• 1 cup Kung Pao sauce, store-bought or made ahead
• 1/4 cup roasted peanuts, for serving

Instructions

1. Place the sliced flank steak at the bottom of the slow cooker basin. Distribute the chopped green bell peppers evenly over the meat, then sprinkle the crushed red pepper flakes across the top.
2. Pour the Kung Pao sauce over the layered beef and peppers. Cover the slow cooker and cook on low for 4 hours, or until the beef reaches an internal temperature of 145°F (63°C). Once cooked, remove the beef and let it rest for at least 3 minutes before serving.
3. Serve the tender beef warm over steamed rice and top with roasted peanuts for added texture and crunch.

Contains: gluten, peanuts, soy

Estimated nutrition per serving

Calories

380

Protein

32.5 g

Carbohydrates

18 g

Fat

19.5 g

Fiber

2 g

Sugar

12 g

Sodium

850 mg

Automatic estimate from the ingredient list, not laboratory-verified.