Name: Crock Pot Pepper Steak
Prep time: 15 min
Cook time: 390 min
Total time: 405 min
Ingredients: 2 lbs beef sirloin (or flank, round, or chuck, sliced into ¼-inch strips against the grain); 3 bell peppers — mix of red (green, and yellow — sliced into strips); 1 large yellow onion (sliced); 3 garlic cloves (minced); 1 teaspoon grated fresh ginger (or ½ teaspoon ground ginger); 1¼ cups beef broth; ¼ cup soy sauce (low-sodium if you prefer); 1 can (14.5 oz diced tomatoes, undrained (or 2 tablespoons tomato paste + ½ cup extra broth)); 2 tablespoons brown sugar (or honey); 1 tablespoon Worcestershire sauce; ½ teaspoon black pepper; ¼ teaspoon red pepper flakes (optional, for gentle heat); 2 tablespoons cornstarch + 2 tablespoons cold water (for thickening at the end); Sliced green onions and sesame seeds (to serve (optional)); Only if you sear the beef (optional Step 1: 1 tablespoon oil.)

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Pepper steak is one of those takeout favorites that turns out to be made for the slow cooker: strips of beef simmered in a savory-sweet soy and tomato sauce until they are melt-in-your-mouth tender, with sweet bell peppers and onions in every bite. Ten minutes of slicing in the morning, and dinner cooks itself.

But let’s be honest about the one complaint slow cooker pepper steak always gets: mushy peppers. Cook them for 7 hours and they melt into the sauce. This recipe fixes that with a simple timing trick most recipes skip — half the peppers go in at the start to flavor the sauce, and the rest go in near the end, so you get deep pepper flavor and peppers with a bite. You can even choose all-crisp or all-soft. Your call, explained clearly below.

Why You’ll Love This Recipe

Takeout flavor, slow cooker effort — the sauce tastes like your favorite restaurant version.
Peppers with actual texture — the two-stage timing trick ends the mushy-pepper problem.
Budget-friendly — sirloin, round, flank, or even chuck all work; use what is on sale.
One pot, easy serving — spoon it over rice and dinner is done.
Naturally flexible — gluten-free and low-sodium versions take one simple swap each (see Variations).

The Best Cut of Beef for Pepper Steak

Sirloin is my pick: tender, beefy, and reasonably priced, and it slices beautifully into strips. Flank steak is the takeout classic (slice it thin, always against the grain). Round steak is the budget workhorse — cut it thin and give it the full cook time. Chuck works too and turns extra tender, though the strips soften more. Whichever you choose, the golden rule below matters more than the cut.

Slice against the grain — the 2-minute skill that changes everything: look at the lines running through the meat (the grain) and slice across them, not along them. This shortens the muscle fibers, and it is the difference between chewy strips and tender ones. Trick from restaurant kitchens: freeze the beef for 10–15 minutes first — firm beef slices thin and even with almost no effort.

Slicing beef against the grain into thin strips for pepper steak

Ingredients

2 lbs beef sirloin (or flank, round, or chuck), sliced into ¼-inch strips against the grain
3 bell peppers — mix of red, green, and yellow — sliced into strips
1 large yellow onion, sliced
3 garlic cloves, minced
1 teaspoon grated fresh ginger (or ½ teaspoon ground ginger)
1¼ cups beef broth
¼ cup soy sauce (low-sodium if you prefer)
1 can (14.5 oz) diced tomatoes, undrained (or 2 tablespoons tomato paste + ½ cup extra broth)
2 tablespoons brown sugar (or honey)
1 tablespoon Worcestershire sauce
½ teaspoon black pepper
¼ teaspoon red pepper flakes (optional, for gentle heat)
2 tablespoons cornstarch + 2 tablespoons cold water (for thickening at the end)
Sliced green onions and sesame seeds, to serve (optional)

Only if you sear the beef (optional Step 1): 1 tablespoon oil.

What Size Slow Cooker Do I Need?

A 5- or 6-quart slow cooker gives the beef and peppers room to sit in the sauce. This recipe doubles well in a 6-quart for meal prep — pepper steak reheats like a dream.

How to Make Pepper Steak (Step by Step)

Pepper steak with colorful bell peppers cooking in a slow cooker

Step 1 — Sear the beef strips (optional, for a takeout-style crust). Heat the oil in a large skillet over high heat and sear the strips in a single layer, 1–2 minutes per side, in two batches — crowding steams them gray instead of browning them. Move the beef to the slow cooker and pour in any skillet juices. No time? Skip it — seasoned raw strips straight into the cooker still come out tender and flavorful.

Step 2 — Mix the sauce. Whisk the broth, soy sauce, diced tomatoes with their juice, brown sugar, Worcestershire, garlic, ginger, black pepper, and red pepper flakes (if using). Give it a taste now — this is your one chance to adjust before cooking: a pinch more sugar for sweetness, a splash more soy for salt.

Step 3 — Load the cooker. Put the onion and half the pepper strips in the slow cooker with the beef, and pour the sauce over everything.

Step 4 — Cook low and slow. Cover and cook on LOW for 6–7 hours or HIGH for 3–4 hours, until the beef strips are tender.

Step 5 — Add the rest of the peppers. Stir in the remaining pepper strips, cover, and cook 30–45 more minutes on HIGH (or 45–60 on LOW) — just until they are bright and crisp-tender. Prefer soft, melt-in peppers throughout? Add ALL the peppers back in Step 3 and skip this step. Prefer maximum crunch? Hold all of them for this step.

Step 6 — Thicken and serve. Stir the cornstarch and cold water into a slurry, stir it into the sauce, and cook 15 more minutes on HIGH until glossy. Serve generously over rice with green onions and sesame seeds on top.

Emily’s Best Tips

Cornstarch goes in at the end — always. A slurry added at the start breaks down over hours of cooking and the sauce thins back out. The last 15 minutes is the rule for every slow cooker sauce.
Bland sauce fix: a splash more soy or Worcestershire, or a teaspoon of vinegar or lemon juice at the end, brightens everything.
Thin sauce rescue: a second small slurry, or 20 minutes with the lid off on HIGH, concentrates it fast.
Double-slice trick for round steak: cut budget round extra thin (⅛ inch) against the grain — thin slices of a lean cut eat far more tender than thick ones.

Variations

Gluten-free: swap the soy sauce for tamari and check your Worcestershire label — everything else is naturally gluten-free.
Spicy pepper steak: double the red pepper flakes, or add a sliced jalapeño with the late peppers and a drizzle of sriracha at serving.
With mushrooms: 8 oz sliced mushrooms in at Step 3 soak up the sauce beautifully.
Sweet takeout style: add 1 tablespoon hoisin sauce to the sauce mix for that glossy, slightly sweet restaurant finish.

What to Serve with Pepper Steak

Pepper steak served over rice in a bowl with glossy savory sauce

Serve the sauce generously — it is half the point. White or jasmine rice is the classic, brown rice the hearty option, buttered egg noodles the comfort pick, and cauliflower rice keeps it low-carb. A crisp green salad or simple steamed broccoli on the side balances the rich sauce.

Storage, Freezing, and Reheating

Fridge: airtight, up to 4 days — the flavor deepens overnight.
Freezer: up to 3 months. For a freezer dump bag: raw beef strips, onion, and the whisked sauce (peppers and cornstarch stay out) frozen flat; thaw overnight, cook as directed, add peppers and thicken at the end. Peppers freeze poorly cooked, so the late-add timing also protects their texture here.
Reheat: gentle heat on the stovetop or in the microwave in bursts, with a splash of water if the sauce has thickened in the fridge.
Make ahead: slice the beef and peppers and mix the sauce the night before (stored separately in the fridge); morning-you just dumps and goes.

Frequently Asked Questions

How long does pepper steak take in the slow cooker?
LOW 6–7 hours or HIGH 3–4 hours, plus 30–45 minutes after the late peppers go in. LOW keeps the beef most tender.

When should I add the peppers so they don’t get mushy?
Add half at the start for flavor and the rest in the last 30–45 minutes — they stay bright and crisp-tender. Adding all of them at the start gives soft, sauce-melted peppers (also delicious, just different).

Can I put raw beef in the slow cooker for pepper steak?
Yes — raw strips cooked for the full time reach a safe temperature and turn tender in the sauce. The sear in Step 1 is optional flavor, never a requirement.

What cut of beef is best for slow cooker pepper steak?
Sirloin for the best balance of tenderness and price; flank for the takeout classic; round sliced very thin for budget; chuck for the most fall-apart result. Always slice against the grain.

How do I thicken pepper steak sauce?
A cornstarch slurry in the last 15 minutes on HIGH. Adding cornstarch at the start does not work — it breaks down over a long cook and the sauce stays thin.

Is crock pot pepper steak gluten-free?
It can be: use tamari instead of soy sauce and a certified gluten-free Worcestershire. The rest of the recipe is naturally gluten-free.

More Slow Cooker Beef Dinners to Try Next

Beef week continues with Crock Pot Beef Tips and Gravy, Slow Cooker Beef Stew, and Easy Slow Cooker Pot Roast — or browse All Recipes for the whole collection.