This is a beef-and-pepper dish built around tender strips of steak, sweet bell peppers, onions, garlic, and a savory soy-based sauce that thickens into a glossy gravy. The best Slow Cooker Pepper Steak keeps the beef tender and the peppers distinct instead of cooking everything until it becomes soft and watery.
The cut of beef matters. Sirloin gives a cleaner, meatier bite, while chuck becomes exceptionally tender with longer cooking. Slice the beef across the grain so the muscle fibers stay short and easy to chew. Bell peppers should go in later than the meat if you want them tender but still recognizable.
Ingredients
- 2 pounds (900 g) beef sirloin, chuck steak, or flank steak
- 1 large green bell pepper
- 1 large red bell pepper
- 1 large yellow bell pepper, optional
- 1 medium yellow onion
- 3 cloves garlic, minced
- 1 cup (240 ml) low-sodium beef broth
- 1/3 cup (80 ml) low-sodium soy sauce
- 2 tablespoons Worcestershire sauce
- 1 tablespoon brown sugar
- 1 tablespoon tomato paste
- 1 teaspoon freshly ground black pepper
- 1/2 teaspoon ground ginger
- 1/2 teaspoon onion powder
- 1 tablespoon neutral cooking oil
- 2 tablespoons cornstarch
- 3 tablespoons cold water
- Salt, as needed
- Sliced green onions, optional for serving
How to Make Slow Cooker Pepper Steak
Step 1: Prepare and Brown the Beef
Trim away large pieces of exterior fat and any tough silver skin.
Slice the beef into strips about 1/2 inch thick, cutting across the grain. If the meat feels too soft to slice cleanly, place it in the freezer for 15 to 20 minutes first. Slightly firm beef is much easier to cut into even strips.
Pat the beef dry with paper towels. Moisture prevents proper browning.
Heat the oil in a large skillet over medium-high to high heat. Add the beef in batches, keeping the pieces in a single layer. Brown for about 60 to 90 seconds per side.
You are not trying to cook the beef through. The goal is to create a browned exterior that contributes deeper flavor to the finished sauce.
Transfer the browned beef to the slow cooker.
You can skip browning if time is limited, but the sauce will taste lighter and more like braised beef than seared steak.
Step 2: Build the Sauce and Slow Cook
Slice the onion into medium strips and add it to the slow cooker with the beef.
In a bowl or measuring jug, whisk together the beef broth, soy sauce, Worcestershire sauce, brown sugar, tomato paste, garlic, black pepper, ground ginger, and onion powder.
Pour the mixture over the beef and onions.
Cover and cook on LOW for 5 to 6 hours or HIGH for about 2 1/2 to 3 1/2 hours.
The exact cooking time depends on the beef cut and the slow cooker. Chuck generally benefits from longer cooking, while sirloin can become dry if left too long.
Check the beef before the final hour. It should be tender enough to bite through easily but should not be disintegrating into shreds.
Slice the bell peppers into strips about 1/2 inch wide.
Add them during the final 45 to 60 minutes on LOW, or the final 25 to 35 minutes on HIGH.
Adding the peppers late keeps them brighter, sweeter, and slightly firm. Putting them in at the beginning produces very soft peppers and releases more water into the sauce.
Step 3: Thicken and Finish the Sauce
Once the beef is tender and the peppers are cooked to your preference, mix the cornstarch with the cold water until completely smooth.
Pour the slurry into the slow cooker while stirring the sauce.
Cover and cook on HIGH for another 10 to 20 minutes, or until the sauce thickens enough to lightly coat the beef and peppers.
Cornstarch needs heat to activate. If the sauce remains thin, make sure the slow cooker is hot before adding more thickener.
Taste before adding salt. Soy sauce, Worcestershire sauce, and beef broth already contribute significant seasoning.
Add more freshly ground black pepper if you want a stronger pepper-steak character. Black pepper should be noticeable but should not overwhelm the sweetness of the bell peppers.
Let the finished dish rest uncovered for about 5 minutes before serving. The sauce will continue to tighten slightly as it cools.
A well-cooked Slow Cooker Pepper Steak should have tender beef rather than stringy meat, peppers that still hold their shape, and enough thickened sauce to coat rice without turning the plate soupy.
What to Serve With Slow Cooker Pepper Steak
Steamed long-grain white rice is the classic pairing because it absorbs the savory sauce without adding competing flavors.
Jasmine rice works particularly well if you prefer a more aromatic base. Brown rice gives the meal more chew and nuttiness but needs a little more sauce because it absorbs liquid differently.
Egg noodles are another good option. Their wider surface carries the gravy well, especially if you prefer a beef-and-noodles style meal.
Mashed potatoes work surprisingly well with the rich sauce, although the result moves away from the dish’s Chinese-American character.
For a lighter plate, serve the beef over steamed broccoli, cauliflower rice, shredded cabbage, or lightly sautéed vegetables.
A crisp cucumber salad or vinegar-dressed slaw provides acidity that cuts through the savory sauce.
Slow Cooker Pepper Steak Nutrition Information
Approximate nutrition per serving, based on 6 servings and excluding rice or other side dishes:
- Calories: 390
- Protein: 37 g
- Carbohydrates: 16 g
- Fat: 19 g
- Saturated fat: 6 g
- Fiber: 3 g
- Sugar: 8 g
- Sodium: 980 mg
Nutrition values will vary with the cut of beef, amount of trimming, broth, soy sauce, and serving size.
FAQs
What is the best cut of beef for pepper steak?
Sirloin is one of the best choices if you want tender slices that still hold their shape.
Chuck steak works well for a softer braised texture and is usually less expensive.
Flank steak can also be used, but it must be sliced thinly across the grain. If sliced with the grain, flank can seem chewy even after long cooking.
Do I have to brown the beef first?
No, but browning improves the flavor.
Searing creates roasted notes that cannot develop inside the moist environment of a slow cooker. If convenience matters more than maximum flavor, you can place the raw beef directly into the crock.
Why is my pepper steak watery?
Bell peppers, onions, and beef all release liquid while cooking.
Using too much broth or adding the peppers at the beginning can make the sauce particularly thin.
Thicken it near the end with a cornstarch slurry rather than adding extra cornstarch directly to the cooker.
Can I put the peppers in at the beginning?
You can, but they will become very soft.
For peppers that retain some structure and fresh sweetness, add them during the final hour on LOW or final half hour on HIGH.
Can I use frozen bell peppers?
Yes, although frozen peppers release more water and soften faster.
Add them during the final 20 to 30 minutes rather than cooking them for a full hour.
You may also need slightly more cornstarch to thicken the additional liquid.
Why did my beef turn tough?
The likely cause depends on the cut.
Tender cuts such as sirloin can become dry and firm from excessive cooking. Tougher cuts such as chuck may seem chewy if they have not cooked long enough for the collagen to soften.
Also check how the meat was sliced. Cutting across the grain makes a major difference in tenderness.
Can I cook this on HIGH instead of LOW?
Yes.
Cook for roughly 2 1/2 to 3 1/2 hours on HIGH, checking the beef toward the earlier end of that range.
LOW heat generally gives you a wider margin before lean beef becomes overcooked.
How can I make the sauce less salty?
Use low-sodium beef broth and low-sodium soy sauce.
You can also reduce the soy sauce slightly and replace the difference with unsalted broth.
Do not add salt until you taste the finished sauce.
Can I make it spicy?
Yes. Add crushed red pepper flakes, sliced fresh chili, chili garlic sauce, or a small amount of sambal oelek.
Add spicy condiments gradually because the slow cooker concentrates flavors over several hours.
Can I prepare it ahead of time?
Yes.
Slice the beef and vegetables and mix the sauce up to one day ahead. Store the components separately in the refrigerator.
For food safety, do not leave raw beef sitting overnight in the slow cooker insert at room temperature.
How long do leftovers keep?
Store cooled leftovers in an airtight container in the refrigerator for up to 3 to 4 days.
Reheat gently on the stovetop or in the microwave until steaming hot. Add a splash of beef broth or water if the sauce becomes too thick.
Can I freeze leftovers?
Yes.
Freeze the beef and sauce in an airtight freezer-safe container for up to 3 months.
The peppers will be softer after thawing, but the flavor remains good. Thaw overnight in the refrigerator before reheating.