Slow-Cooker Pepper Steak: Tender Beef and Peppers in Savory Sauce

Slow-Cooker Pepper Steak brings tender strips of beef, colorful bell peppers, onions, and a rich savory sauce together in an easy slow-cooked dinner. Beef broth, soy sauce, tomato sauce, Worcestershire sauce, and brown sugar create a balanced sauce that becomes thick and glossy before serving.

This recipe works with beef sirloin or chuck steak. Slice the meat thinly against the grain, add it to the slow cooker with the vegetables, and let gentle heat do most of the work. Meanwhile, garlic, smoked paprika, and optional sesame oil add layers of flavor without making preparation complicated.

Slow-Cooker Pepper Steak tastes especially good spooned over steamed white rice because the rice catches every bit of sauce. However, noodles also make an excellent base. With about 6 to 7 hours on LOW or 3 to 4 hours on HIGH, you can turn simple ingredients into a hearty, comforting meal.

I started making pepper steak in the slow cooker when I wanted the familiar combination of beef, peppers, onions, and savory sauce without standing over a skillet at dinnertime. I quickly learned that slicing the beef thinly makes a noticeable difference. Cutting across the grain creates shorter muscle fibers, so each bite feels more tender after slow cooking. I also like waiting until the final part of cooking to thicken the sauce. At first, it may look thinner than expected, but the cornstarch slurry changes it quickly. After another 20 to 30 minutes, the sauce becomes glossy and clings beautifully to the beef and vegetables.

Preparing the Beef and Vegetables

Slice and Season the Beef

Start with 2 pounds beef sirloin or chuck steak.

Using a sharp knife, cut the beef into thin strips against the grain. Look for the direction of the visible muscle fibers and slice across them rather than following them.

Thin strips work particularly well for Slow-Cooker Pepper Steak because they provide plenty of surface area for the savory sauce.

Place the sliced beef in a bowl or directly into the slow cooker.

Season lightly with ½ teaspoon salt, ½ teaspoon black pepper, and 1 teaspoon smoked paprika.

Toss gently so the seasonings distribute across the beef.

The smoked paprika provides subtle smoky flavor and also complements the tomato sauce and Worcestershire sauce in the cooking liquid.

Add the Peppers, Onion, and Garlic

Slice 2 bell peppers and 1 large onion.

Then mince 3 garlic cloves.

Add the peppers, sliced onion, and garlic to the slow cooker with the seasoned beef.

You can use whichever bell pepper colors you prefer. Using two different colors creates an especially appealing finished dish.

Distribute the vegetables throughout the beef rather than leaving everything piled in separate sections.

As Slow-Cooker Pepper Steak cooks, the vegetables release moisture and flavor into the sauce.

The onion also becomes increasingly tender during the long cooking period, while the peppers soften and absorb the savory cooking liquid.

Once the beef and vegetables are in place, prepare the sauce separately before pouring it into the slow cooker.

Making the Savory Pepper Steak Sauce

Whisk Together the Sauce Ingredients

In a medium bowl, combine 1 cup beef broth and ½ cup low-sodium soy sauce.

Add ¼ cup tomato sauce, 2 tablespoons Worcestershire sauce, and 1 tablespoon brown sugar.

If you’re using it, add 1 tablespoon sesame oil.

Whisk until the brown sugar disperses throughout the liquid.

The combination gives Slow-Cooker Pepper Steak its savory character.

Beef broth forms the base, while soy sauce provides saltiness and depth. Tomato sauce adds body and mild acidity. Meanwhile, Worcestershire sauce contributes another savory layer.

Brown sugar balances those stronger flavors with a touch of sweetness.

Finally, optional sesame oil adds a distinctive toasted aroma, so a small amount goes a long way.

Pour the Sauce Over the Beef

Pour the prepared sauce evenly over the beef, peppers, onions, and garlic.

Gently stir the ingredients so the sauce reaches the meat and vegetables throughout the slow cooker.

You don’t need to completely submerge everything.

As the ingredients cook, they will release additional moisture into the pot.

Place the lid securely on the slow cooker.

At this stage, most of the active preparation for Slow-Cooker Pepper Steak is finished.

However, don’t add the cornstarch directly to the slow cooker yet. Save it for the final 20 to 30 minutes.

Adding the cornstarch slurry near the end allows you to thicken the cooking liquid into a glossy sauce after the beef has already become tender.

Slow Cooking and Thickening the Pepper Steak

Cook the Beef Until Tender

Cook Slow-Cooker Pepper Steak on LOW for 6 to 7 hours.

Alternatively, cook it on HIGH for 3 to 4 hours.

Keep the slow cooker covered during most of the cooking time.

The beef should become tender as it slowly cooks in the broth and seasonings.

Meanwhile, the peppers and onions soften and contribute their flavor to the sauce.

Cooking times can vary somewhat between slow cookers and according to the thickness of the beef strips. Therefore, check the texture near the end of the recommended range.

The beef should feel tender when it’s ready for the final thickening step.

Make and Add the Cornstarch Slurry

During the final 20 to 30 minutes, place 2 tablespoons cornstarch in a small bowl.

Add 3 tablespoons cold water.

Stir until completely smooth.

Always mix the cornstarch with cold water before adding it to the hot slow cooker. This helps prevent dry lumps from forming in the sauce.

Pour the slurry into the slow cooker and stir gently.

Cover again and continue cooking for 20 to 30 minutes.

As the sauce heats, it should become noticeably thicker and glossier.

Give everything a final stir so the sauce evenly coats the beef, peppers, and onions.

Serving Slow-Cooker Pepper Steak

Finish With Fresh Green Onions

Once the sauce has thickened, taste it and adjust the seasoning only if necessary.

Because soy sauce, Worcestershire sauce, and beef broth already contribute salt, you may not need additional salt.

Slice 2 green onions and scatter them across the finished Slow-Cooker Pepper Steak.

The fresh green onions provide color and a mild, crisp onion flavor that contrasts nicely with the slowly cooked vegetables.

Serve the pepper steak hot while the sauce remains glossy.

When portioning the meal, make sure each serving gets plenty of beef strips, peppers, onions, and sauce.

Serve With Rice or Noodles

Steamed white rice makes a simple base for Slow-Cooker Pepper Steak.

Spoon the beef and vegetables over the rice, then add extra sauce from the slow cooker.

The rice absorbs the savory cooking liquid and turns the pepper steak into a complete, filling meal.

Alternatively, serve the beef over cooked noodles.

Either option works particularly well because both provide a neutral base for the strongly flavored sauce.

For a lighter serving, you can also enjoy the beef and vegetables on their own.

Regardless of the accompaniment, serve the dish soon after the sauce finishes thickening for the best glossy consistency.

Ingredients

• 2 pounds beef sirloin or chuck steak, thinly sliced
• 2 bell peppers, sliced
• 1 large onion, sliced
• 3 cloves garlic, minced
• 1 cup beef broth
• ½ cup low-sodium soy sauce
• ¼ cup tomato sauce
• 2 tablespoons Worcestershire sauce
• 1 tablespoon brown sugar
• 1 teaspoon smoked paprika
• ½ teaspoon black pepper
• ½ teaspoon salt
• 2 tablespoons cornstarch
• 3 tablespoons cold water
• 1 tablespoon sesame oil, optional
• 2 green onions, sliced, for garnish

Instructions

1. Slice the beef into thin strips against the grain. Season with the salt, black pepper, and smoked paprika.
2. Place the seasoned beef, sliced bell peppers, sliced onion, and minced garlic in the slow cooker.
3. Whisk together the beef broth, low-sodium soy sauce, tomato sauce, Worcestershire sauce, brown sugar, and optional sesame oil.
4. Pour the prepared sauce over the beef and vegetables. Stir gently to distribute the ingredients.
5. Cover and cook on LOW for 6 to 7 hours or HIGH for 3 to 4 hours, until the beef becomes tender.
6. During the final 20 to 30 minutes, combine the cornstarch and cold water in a small bowl and stir until completely smooth.
7. Stir the cornstarch slurry into the slow cooker. Cover and continue cooking until the sauce becomes thick and glossy.
8. Gently stir the beef and vegetables so everything becomes evenly coated with the thickened sauce.
9. Garnish with sliced green onions and serve hot over steamed white rice or noodles.

Frequently Asked Questions

What cut of beef works best for Slow-Cooker Pepper Steak?

The recipe works with either beef sirloin or chuck steak. Whichever cut you choose, slice it thinly against the grain before adding it to the slow cooker.

Can I cook pepper steak on HIGH instead of LOW?

Yes. Cook it on HIGH for 3 to 4 hours. Alternatively, cook it on LOW for 6 to 7 hours until the beef becomes tender.

Why do I add the cornstarch near the end?

The cornstarch slurry thickens the cooking liquid into a glossy sauce. Adding it during the final 20 to 30 minutes lets the beef cook first and allows you to thicken the finished cooking liquid afterward.

Is sesame oil required?

No. The tablespoon of sesame oil is optional. Add it when you want an extra layer of toasted flavor, or simply leave it out.

What should I serve with pepper steak?

Steamed white rice and noodles both pair well with the tender beef, peppers, onions, and savory sauce. Rice works particularly well for absorbing the extra gravy-like sauce.

Conclusion

Slow-Cooker Pepper Steak makes a hearty beef dinner with very little hands-on cooking.

Thin strips of sirloin or chuck slowly cook with bell peppers, onions, and garlic. Meanwhile, beef broth, soy sauce, tomato sauce, Worcestershire sauce, brown sugar, and smoked paprika create a deeply savory cooking liquid.

During the final 20 to 30 minutes, a simple cornstarch slurry transforms that liquid into a thick, glossy sauce that coats every piece of beef and pepper.

Finish Slow-Cooker Pepper Steak with fresh green onions and spoon it generously over steamed white rice or noodles. The result is a tender, saucy, satisfying slow-cooker dinner that works especially well when you want most of the cooking handled hours before mealtime.