When you want a hearty dinner that tastes like you spent hours in the kitchen, Slow Cooker Pepper Steak is the recipe to keep in your back pocket. Tender strips of beef simmer slowly with colorful bell peppers, onions, garlic, and a rich savory sauce until everything is deliciously tender and flavorful.
This easy slow cooker dinner is especially useful on busy weekdays. Once the ingredients are prepared and added to the crockpot, most of the work is done for you. The beef gradually absorbs the sweet, savory, and slightly spicy flavors of the sauce while the peppers and onions become tender without completely disappearing into the dish.
Serve this comforting pepper steak over steamed white rice, brown rice, or noodles, and you have a filling family dinner that everyone can enjoy.
Why You’ll Love This Slow Cooker Pepper Steak
There are plenty of reasons this recipe deserves a place in your regular dinner rotation.
First, it uses simple ingredients that are easy to find at almost any grocery store. Thinly sliced steak, bell peppers, onions, garlic, soy sauce, beef broth, and a handful of seasonings come together to create a surprisingly flavorful meal.
The slow cooker also makes the beef tender and allows the sauce to develop a deeper flavor as it cooks. The combination of tomato paste and brown sugar gives the sauce a balanced sweet-and-savory character, while ginger and red pepper flakes add extra warmth.
Most importantly, this is a flexible recipe. You can serve it over rice for a classic comfort-food dinner, spoon it over noodles, or add extra vegetables when you want to stretch the meal.
Ingredients
For the Pepper Steak
- 2 pounds (about 1 kg) beef steak, thinly sliced, such as sirloin or flank steak
- 1 medium onion, thinly sliced
- 1 red bell pepper, thinly sliced
- 1 green bell pepper, thinly sliced
- 3 cloves garlic, minced
For the Sauce
- 1/2 cup beef broth or beef stock
- 1/4 cup soy sauce
- 2 tablespoons tomato paste
- 2 tablespoons brown sugar
- 1 teaspoon fresh ginger, minced or grated
- 1/4 teaspoon black pepper
- 1/4 teaspoon red pepper flakes, or more to taste
Optional Thickener and Garnishes
- 2 tablespoons cornstarch
- 2 tablespoons water
- 2 green onions, thinly sliced
- Sesame seeds
For Serving
- Cooked white or brown rice
- Cooked noodles, if preferred
How to Make Slow Cooker Pepper Steak
1. Prepare the Beef
Start by slicing the steak into thin strips. If you’re using flank steak, cut it against the grain. This helps shorten the muscle fibers and makes the beef easier to chew once cooked.
If the steak is difficult to slice thinly, place it in the freezer for about 15 to 20 minutes first. Slightly chilled beef is firmer and much easier to cut evenly.
2. Make the Sauce
In a medium bowl, whisk together the beef broth, soy sauce, tomato paste, brown sugar, ginger, black pepper, and red pepper flakes.
The tomato paste adds richness and body, while the brown sugar balances the salty soy sauce. Ginger provides a subtle aromatic flavor, and red pepper flakes give the dish a gentle kick.
Taste the sauce before adding it to the beef if desired. Remember that soy sauce is naturally salty, so additional salt usually isn’t necessary.
3. Marinate the Beef
Place the sliced beef in a large bowl or resealable food-safe bag.
Pour about half of the prepared sauce over the beef and toss until every piece is coated. Cover the bowl or seal the bag and refrigerate for at least 30 minutes.
For even more flavor, let the beef marinate for 1 to 2 hours.
Keep the remaining sauce separate so it can be added to the slow cooker later.
4. Layer the Vegetables
Lightly arrange the sliced onion, red bell pepper, green bell pepper, and minced garlic in the bottom of your slow cooker.
The vegetables create a flavorful base for the beef while releasing moisture as they cook.
Try to slice the peppers and onions into reasonably similar sizes so they cook at roughly the same rate.
5. Add the Beef
Place the marinated beef over the vegetables.
Pour the reserved sauce over everything, making sure the beef and vegetables are evenly coated.
There is no need to stir excessively. Once everything is in the slow cooker, simply cover it with the lid.
6. Slow Cook Until Tender
Cook on LOW for 6 to 8 hours or HIGH for 3 to 4 hours.
The exact cooking time can vary depending on the size and model of your slow cooker and the thickness of your beef strips. The goal is tender beef and vegetables that have absorbed plenty of flavor.
For the best texture, avoid repeatedly removing the lid during cooking. Every time you open the slow cooker, heat escapes and the cooking process can be delayed.
7. Thicken the Sauce
If you prefer a thicker, more gravy-like sauce, make a simple cornstarch slurry.
Whisk together 2 tablespoons cornstarch and 2 tablespoons cold water until smooth.
About 30 minutes before serving, stir the slurry into the slow cooker. Cover and continue cooking until the sauce thickens.
Don’t sprinkle dry cornstarch directly into the slow cooker because it can form unpleasant lumps.
8. Garnish and Serve
Once the beef is tender and the sauce has reached your preferred consistency, taste the dish.
Adjust the seasoning if necessary. If you want additional heat, add a small pinch of red pepper flakes.
Spoon the pepper steak generously over freshly cooked rice or noodles. Finish with sliced green onions and a sprinkle of sesame seeds for a little freshness and crunch.
Tips for the Best Slow Cooker Pepper Steak
Slice the beef thinly. Thin strips cook more evenly and are easier to eat.
Cut against the grain. This is especially important when using flank steak because it helps create a more tender bite.
Don’t skip the marinade. Even a short 30-minute marinade gives the beef an opportunity to absorb some of the sauce’s flavor.
Use fresh ginger when possible. Ground ginger can work in a pinch, but fresh ginger provides a brighter, more aromatic flavor.
Don’t overcook the vegetables. If you prefer bell peppers with a little more texture, add them later in the cooking process rather than at the beginning.
Thicken only if needed. The sauce will naturally have some body from the tomato paste and cooking juices. The cornstarch slurry is optional.
Can I Use a Different Cut of Beef?
Absolutely. Sirloin and flank steak are excellent choices, but other tender cuts can work as well.
Thinly sliced chuck steak can also be used, although it may require a little more cooking time to become tender. Avoid very lean cuts that can become dry when cooked for a long period.
For the most consistent results, choose beef that can be sliced into thin strips and has enough natural tenderness to work well with slow cooking.
Easy Variations
One of the best things about this recipe is how easily you can customize it.
For more vegetables, add sliced mushrooms, carrots, snow peas, or broccoli.
For extra heat, increase the red pepper flakes or add a small amount of your favorite hot sauce.
For a slightly sweeter sauce, add another teaspoon of brown sugar.
You can also replace some of the green bell pepper with yellow or orange peppers for a sweeter flavor and more color.
If you prefer noodles instead of rice, serve the finished beef and vegetables over egg noodles, rice noodles, or another favorite variety.
What to Serve With Pepper Steak
The easiest option is steamed white rice. The rice soaks up the flavorful sauce and makes the meal extra satisfying.
Brown rice is another good choice if you prefer a heartier grain. Noodles also work beautifully, especially when tossed with some of the sauce.
For a complete dinner, serve the pepper steak with a simple side salad, steamed broccoli, or roasted vegetables.
Storage and Reheating
Allow leftover pepper steak to cool before transferring it to an airtight container.
Refrigerate leftovers for up to 3 to 4 days.
To reheat, warm individual portions in the microwave or gently reheat the beef and sauce in a saucepan over medium-low heat. Add a small splash of beef broth or water if the sauce has thickened too much in the refrigerator.
You can also freeze the cooked pepper steak in a freezer-safe container. Thaw it in the refrigerator before reheating.
Frequently Asked Questions
Can I make pepper steak without marinating the beef?
Yes. The marinade adds flavor, but you can skip the separate marinating step when you’re short on time. Simply combine the sauce ingredients and add them directly to the slow cooker with the beef and vegetables.
Why is my pepper steak sauce too thin?
Slow cookers retain moisture, so the sauce may be thinner than expected. A cornstarch slurry is an easy solution. Mix equal parts cornstarch and cold water, stir it into the dish near the end of cooking, and allow it to cook until thickened.
Can I make this recipe less spicy?
Definitely. The red pepper flakes are optional, so leave them out for a mild version or reduce the amount for just a touch of heat.
What is the best rice for pepper steak?
Regular long-grain white rice is a simple choice, but jasmine or basmati rice can also be delicious. Brown rice works well when you want a heartier option.
Final Thoughts
Slow Cooker Pepper Steak is proof that an uncomplicated meal can still deliver plenty of flavor. Tender beef, sweet and savory sauce, colorful peppers, and onions come together in the slow cooker to create a comforting dinner with very little hands-on work.
Whether you’re feeding the family on a busy weeknight or simply craving a warm bowl of beef and rice, this recipe is easy to customize and satisfying from the first bite. Add your favorite vegetables, adjust the spice level, and serve it over rice or noodles for a simple homemade dinner everyone will want again.