Slow Cooker Pepper Steak is a hearty, flavorful dinner made with tender strips of beef, colorful bell peppers, onions, garlic, and a rich savory sauce that slowly develops as everything cooks together. It is the kind of comforting meal that requires very little hands-on work but still delivers deep flavor and satisfying texture.
This easy slow cooker pepper steak recipe is perfect for busy weekdays, family dinners, meal prep, or anytime you want a warm homemade meal waiting for you at the end of the day. The beef cooks gently until tender, while soy sauce, Worcestershire sauce, beef broth, garlic, and seasonings create a rich sauce that coats every bite.
Serve Slow Cooker Pepper Steak over fluffy white rice, brown rice, mashed potatoes, or noodles. The sauce is especially good spooned over rice, making this an easy complete meal that feels both comforting and practical.
Why You’ll Love This Slow Cooker Pepper Steak
One of the best things about this recipe is how tender the beef becomes. Slow cooking gives the meat plenty of time to soften while absorbing the savory cooking liquid.
The bell peppers add sweetness, color, and a little texture that balances the richness of the beef. Adding them later in the cooking process helps prevent them from becoming overly soft.
This recipe is also easy to customize. You can make it spicy, add mushrooms, increase the garlic, or adjust the sweetness depending on your preference.
Another advantage is the minimal preparation. Once the beef and sauce ingredients are in the slow cooker, most of the cooking happens without supervision.
Ingredients
For the Beef
- 2 pounds beef sirloin, flank steak, or chuck steak
- 1 teaspoon salt
- ½ teaspoon black pepper
- 1 teaspoon garlic powder
- ½ teaspoon onion powder
- 2 tablespoons cornstarch
- 1 tablespoon olive oil, optional for searing
For the Slow Cooker Sauce
- 1 cup low-sodium beef broth
- ⅓ cup low-sodium soy sauce
- 1 tablespoon Worcestershire sauce
- 2 tablespoons brown sugar
- 1 tablespoon tomato paste
- 4 garlic cloves, minced
- 1 teaspoon fresh ginger, grated, optional
- ½ teaspoon black pepper
- ¼ teaspoon red pepper flakes, optional
For the Vegetables
- 1 large green bell pepper, sliced
- 1 large red bell pepper, sliced
- 1 large yellow or orange bell pepper, sliced
- 1 large yellow onion, sliced
For Thickening the Sauce
- 2 tablespoons cornstarch
- 3 tablespoons cold water
For Serving
- Cooked white or brown rice
- Chopped green onions
- Sesame seeds, optional
- Fresh parsley, optional
How to Make Slow Cooker Pepper Steak
1. Prepare the Beef
Place the beef on a clean cutting board.
Slice it against the grain into thin strips approximately ¼ to ½ inch thick.
Cutting against the grain is important because it shortens the muscle fibers and helps the beef become more tender.
Pat the beef strips dry with paper towels.
Season with salt, black pepper, garlic powder, and onion powder.
Sprinkle with 2 tablespoons of cornstarch and toss until the beef is lightly coated.
The cornstarch helps the beef develop a light crust if you sear it and also contributes to the body of the sauce.
2. Sear the Beef
This step is optional but recommended for extra flavor.
Heat the olive oil in a large skillet over medium-high heat.
Once hot, add the beef in batches.
Cook for approximately 1–2 minutes per side, just until lightly browned.
Do not cook the beef completely.
The purpose is only to develop some caramelized flavor before transferring it to the slow cooker.
Avoid overcrowding the skillet because too much beef at once can cause it to steam.
Transfer the browned beef to the slow cooker.
3. Prepare the Sauce
In a medium bowl or measuring jug, whisk together the beef broth, soy sauce, Worcestershire sauce, brown sugar, tomato paste, garlic, optional ginger, black pepper, and red pepper flakes.
Continue whisking until the tomato paste is evenly incorporated.
Taste the sauce before adding extra salt. Soy sauce and Worcestershire sauce are already salty, so additional seasoning may not be necessary.
4. Add the Sauce to the Slow Cooker
Pour the prepared sauce over the beef.
Stir gently to coat all the pieces.
Cover the slow cooker with the lid.
At this stage, do not add all the bell peppers yet if you prefer them to maintain some texture.
Slow cooking them for the entire cooking period can make them extremely soft.
5. Slow Cook the Beef
Cook on LOW for approximately 5–6 hours or on HIGH for about 2½–3½ hours.
The exact time depends on the cut and thickness of the beef.
Chuck steak may require a little longer than sirloin or flank steak to become tender.
Avoid repeatedly opening the slow cooker because heat escapes each time the lid is removed.
6. Add the Onion and Bell Peppers
Approximately 1–1½ hours before the end of cooking on LOW, add the sliced onion and bell peppers.
If cooking on HIGH, add them during approximately the final 45–60 minutes.
Stir gently to coat the vegetables with the sauce.
Adding the peppers later allows them to soften while still retaining some shape and texture.
If you prefer very soft peppers, you can add them earlier.
7. Check the Beef for Tenderness
Once the cooking time is nearly complete, check the beef.
It should be tender enough to bite easily without feeling chewy.
If it still feels tough, continue cooking for another 30–60 minutes.
Different cuts of beef soften at different rates, so use tenderness as your main guide rather than relying only on time.
8. Thicken the Pepper Steak Sauce
In a small bowl, whisk together 2 tablespoons of cornstarch and 3 tablespoons of cold water.
Make sure the mixture is completely smooth.
Slowly pour the slurry into the slow cooker while gently stirring.
Turn the slow cooker to HIGH if necessary.
Cover and cook for another 15–20 minutes.
The sauce should gradually become thicker, glossy, and able to coat the beef and vegetables.
If you prefer a thinner sauce, use only half of the cornstarch mixture.
9. Taste and Adjust the Seasoning
Taste the finished sauce.
Add additional black pepper if you want a stronger pepper flavor.
If the sauce is too salty, stir in a small splash of unsalted beef broth.
If you prefer a little extra sweetness, add 1 teaspoon of brown sugar.
For more heat, add additional red pepper flakes or a small amount of hot sauce.
10. Serve the Pepper Steak
Spoon freshly cooked rice into serving bowls.
Add generous portions of beef, bell peppers, and onions over the top.
Drizzle plenty of the thick savory sauce over the rice.
Garnish with chopped green onions, sesame seeds, or parsley if desired.
Serve immediately while hot.
What to Serve With Slow Cooker Pepper Steak
Steamed white rice is one of the best accompaniments because it absorbs the flavorful sauce beautifully.
Jasmine rice, basmati rice, or brown rice also work very well.
For something different, serve the pepper steak over buttered noodles, egg noodles, mashed potatoes, or cauliflower rice.
Vegetable sides such as steamed broccoli, roasted green beans, carrots, or sautéed zucchini can make the meal even more filling.
A simple cucumber salad or fresh green salad also provides a lighter contrast to the rich beef sauce.
Tips for the Best Slow Cooker Pepper Steak
Slice the beef against the grain. This is one of the most important steps for getting tender pieces of meat.
Do not slice the beef too thick. Thin strips absorb flavor more evenly and become tender faster.
Searing is optional, but it adds an extra layer of savory flavor.
Add the bell peppers later in the cooking process if you want them to retain their shape.
Use low-sodium beef broth and soy sauce whenever possible. This gives you better control over the final salt level.
Do not add dry cornstarch directly to the slow cooker. Always mix it with cold water first to prevent lumps.
If the beef is still tough, continue cooking. Slow-cooked beef often simply needs more time.
Easy Recipe Variations
For Mushroom Pepper Steak, add 8 ounces of sliced mushrooms during the final 1–2 hours of cooking.
For Spicy Pepper Steak, add sliced jalapeños, extra red pepper flakes, or a little chili garlic sauce.
For Garlic Pepper Steak, increase the garlic to 6–7 cloves.
For Sweet Pepper Steak, add an extra tablespoon of brown sugar or 1 tablespoon of honey.
For Pepper Steak with Broccoli, add small broccoli florets during the final 30 minutes of cooking.
For a slightly richer sauce, stir in 1 tablespoon of butter just before serving.
You can also use a mixture of green, red, yellow, and orange bell peppers for an especially colorful presentation.
How to Store and Reheat Slow Cooker Pepper Steak
Allow leftovers to cool before transferring them to an airtight container.
Store in the refrigerator for up to 3–4 days.
For the best results, store the rice separately so it does not absorb all the sauce while refrigerated.
Reheat the pepper steak gently in a skillet or saucepan over medium-low heat.
Add a splash of beef broth or water if the sauce becomes too thick.
Individual servings can also be reheated in the microwave using short intervals.
Slow Cooker Pepper Steak can also be frozen for up to 2–3 months.
Keep in mind that bell peppers may become slightly softer after freezing and reheating.
Thaw overnight in the refrigerator before reheating.
Frequently Asked Questions
What cut of beef is best for Slow Cooker Pepper Steak?
Sirloin, flank steak, round steak, and chuck steak can all work.
Chuck is especially good for longer slow cooking, while sirloin and flank steak can become tender more quickly.
When should I add the bell peppers?
For peppers that still have some texture, add them during the final 1–1½ hours on LOW.
If you prefer very soft peppers, add them earlier.
Why is my pepper steak sauce too thin?
Mix cornstarch with cold water and add it near the end of cooking.
Allow the mixture to cook on HIGH for approximately 15–20 minutes until the sauce thickens.
Can I prepare Slow Cooker Pepper Steak ahead of time?
Yes.
You can slice and season the beef and prepare the sauce the night before.
Store them covered in the refrigerator, then add everything to the slow cooker the next day.
Final Thoughts
This Easy Slow Cooker Pepper Steak combines tender beef strips, colorful bell peppers, onions, garlic, and a rich savory sauce into an easy comfort-food dinner that requires very little active cooking.
The slow cooker gives the beef time to become tender while allowing the savory sauce to develop plenty of flavor. Adding the peppers later keeps them colorful and gives the finished dish a satisfying texture.
Serve it generously over rice, noodles, or mashed potatoes and spoon plenty of sauce over every serving. Whether you are preparing a busy weeknight meal, feeding the family, or planning easy leftovers, this Slow Cooker Pepper Steak is a dependable recipe worth keeping in your dinner rotation.