CrockPot Pepper Steak

Try this CrockPot pepper steak when you want strips of beef, thick slices of bell pepper and onion, and a tamari-brown-sugar sauce that cooks on low for about 5 hours — not 10. Sirloin or round, cut against the grain so the strips aren’t ropes. Cornstarch at the end if you want it glossy. Serve over rice cooked in a separate pot. Don’t put frozen steak in the cooker and don’t treat high for 8 hours as a flex. Thick pepper slices stay like peppers; thin ones disappear.

Why You’ll Love This Recipe ❤️

• One cooker, rice on the side.
• Low 5 hours is the window for strips, not an all-day roast.
• Peppers in thick slices so they’re still there at dinner.
• Sauce is pantry: gluten-free tamari, a little brown sugar, gluten-free bouillon, ginger.
• Cornstarch optional if you want Chinese-takeout cling.

Recipe at a Glance

Prep: 15 minutes  ·  Cook: about 5 hours on low  ·  Total: about 5 hours 15 minutes  ·  Servings: 6  ·  Difficulty: easy  ·  Method: slow cooker

Ingredients 🛒

• 2 pounds (900 g) beef sirloin or top round, sliced into strips against the grain
• 1 green bell pepper, thick slices
• 1 red bell pepper, thick slices
• 1 medium onion, thick slices
• 8 ounces sliced mushrooms, optional
• ½ cup water
• 2 beef bouillon cubes or 2 teaspoons beef bouillon paste/granules — verified gluten-free
• 3 tablespoons certified gluten-free tamari or gluten-free soy sauce
• 1 teaspoon certified gluten-free Worcestershire sauce, or omit
• ¼ teaspoon ground ginger
• ¼ teaspoon garlic powder
• ½ teaspoon black pepper
• 2 teaspoons brown sugar
• 1 tablespoon cornstarch + 1 tablespoon cold water, optional, to thicken
• Cooked rice, for serving (naturally gluten-free)

Against the grain. With-the-grain strips are chewy ropes no amount of sauce fixes. Sirloin is the nicer cut here. Stew meat cubes are a different, longer cook and won’t eat like pepper steak.

Thick pepper slices (about ½ inch). Julienne hair-thin peppers melt into the sauce by hour 5. That’s fine if you want it; it’s not “pepper steak” texture.

½ cup water + 2 bouillon is the gravy base. A cup of extra water is soup. Don’t add a can of tomatoes — that’s Swiss steak. Regular beef bouillon often has wheat or barley. Use cubes, paste, or granules that are labeled gluten-free — don’t assume Better Than Bouillon or a store cube is safe.

Certified gluten-free tamari (or a bottle that says gluten-free soy sauce) replaces regular soy sauce, which is brewed with wheat. Tamari that’s only “wheat-free” without a gluten-free claim can still be a cross-contact risk — use certified if you need this genuinely gluten-free.

Worcestershire: many bottles use soy, malt vinegar, or both. Use a certified gluten-free Worcestershire, or skip the teaspoon. The sauce still works without it.

2 teaspoons brown sugar is a hint, not General Tso’s. Extra tamari instead of sugar if you want it saltier, not sweeter.

Check every package — bouillon, tamari, Worcestershire, brown sugar, garlic powder, ginger, cornstarch — for wheat, barley, malt, rye, and shared-equipment / cross-contact warnings. Formulas change. The label in your hand is the one that counts.

Equipment

A 6-quart slow cooker. A small bowl for slurry. Rice cooked separately — don’t put dry rice in this pot with ½ cup water and hope.

How to Make It 👩‍🍳

Beef, peppers, onion in the cooker. Mushrooms too if you’re using them — they go in raw with the peppers, not after. Whisk water, crumbled gluten-free bouillon, tamari (or gluten-free soy sauce), gluten-free Worcestershire if you’re using it, ginger, garlic powder, black pepper, and brown sugar. Pour over. Don’t stir into a mash; a toss is enough. Don’t add extra water for the mushrooms; they give off their own.

Lid. Low 5 hours until the beef is tender and the peppers are soft but not mush. High is about 3 hours if you’re home — check early. Beef strips on high for 6 hours can still be dry around the edges.

If you want it thicker: plain cornstarch (not a gravy mix) + cold water, stir in, high 10–15 minutes. Serve over rice — rice is naturally gluten-free. Don’t swap in soy-sauce noodles or flour wraps and keep calling the plate gluten-free.

If the beef is still tough at 5 hours on low, it may need another 30–60 minutes — some round steaks do. That’s not permission to leave it 10 hours “to be sure.” Overcooked strips shred into tamari string.

Why the Technique Works

Low 5 hours is pepper-steak math for strips, not a chuck roast. Chuck wants 8 hours and falls apart. Sirloin strips want to get tender without becoming pulled beef. Different cut, different clock.

Bouillon + ½ cup water is salty and beefy without a homemade stock project. Low-sodium gluten-free tamari helps if your cubes are aggressive. Taste before you add table salt — you probably don’t need it.

Ginger is ¼ teaspoon powder. A thumb of fresh is nicer if you grate it in. Don’t add a tablespoon of powder.

Searing the beef first is extra flavor and extra dishes. This dump version skips it. If you want the browned taste, sear in a hot skillet in batches, then into the cooker. Don’t steam a pile of gray meat in a crowded pan and call it a sear.

Rice is a separate pot of water. The cooker doesn’t have enough liquid to cook rice and steak together without turning into porridge or crunchy rice.

Cooking Tips

Slice when the beef is slightly firm from the fridge — easier strips.

Don’t lift the lid every hour. Do lift it at 5 hours to check tenderness.

Variations and Substitutions

All green peppers: fine. Two colors is nicer on the plate.

No Worcestershire: skip it — that’s the gluten-free path if you can’t find a certified bottle. A splash more tamari is optional, not required.

Fresh garlic: 2 cloves instead of powder.

Mushrooms: 8 ounces sliced, in with the peppers. Optional — the sauce and peppers don’t need them. They will throw off liquid, so skip extra water.

Flank steak: slice thin against the grain, check earlier so it doesn’t dry.

Serving Suggestions

Rice — naturally gluten-free, cooked in a separate pot. Green onion if you have it. That’s the plate. Don’t add lo mein, egg noodles, or flour tortillas and keep the gluten-free claim.

Storage, Freezing & Reheating

Fridge 3–4 days. Reheat on the stove with a splash of water. Microwave, stir.

Freeze up to 3 months. Peppers get softer. Thaw in the fridge. Rice frozen separately or make it fresh.

Cool before you lid a deep container of hot beef.

Troubleshooting

Chewy beef: sliced with the grain, or undercooked round. Against the grain, more time in 30-minute steps, or a more tender cut next time.

Dry, stringy: too long, especially on high. 5 hours low is the target.

Watery: extra water, lid condensation. Slurry, or lid off 15 minutes on high.

Salty: bouillon + tamari + Worcestershire. Low-sodium gluten-free tamari, taste, no extra salt.

Mushy peppers: sliced too thin, or 8 hours. Thick slices, 5 hours.

FAQ

Can I cook it 8 hours on low while I’m at work?

Strips may overshoot. A programmable cooker that goes to warm, or a chuck-style recipe. 5 hours is this method.

Do I have to thicken it?

No. The sauce is thinner without cornstarch. Still good on rice.

Can I use regular soy sauce?

The beef will still cook. It will not be gluten-free. Regular soy is brewed with wheat. Same for regular Worcestershire and unlabeled bouillon. If you needed this genuinely gluten-free, stay with certified tamari (or GF soy), certified Worcestershire or none, and bouillon you checked.

Sirloin or stew meat?

Sirloin or round strips. Stew cubes are a different texture and often need longer.

Can I add mushrooms?

Yes. They’ll give off water. Don’t add a cup of extra liquid.

Is the beef 165°F like chicken?

Beef strips are done when tender, not at a chicken number. If you started with raw beef, cook until it’s past raw and tender. Don’t serve the center raw because “steak is better pink” inside a 5-hour cooker — that’s not a reverse-sear.

Nutrition, Allergens & Dietary Notes

Approx, per 1 of 6 servings without rice:

• Calories: 280–360
• Protein: 32–38 g
• Carbs: 8–12 g
• Fat: 12–18 g

This recipe is gluten-free as written when you use certified gluten-free tamari or gluten-free soy sauce, certified gluten-free Worcestershire or omit it, and beef bouillon you verified is gluten-free, then serve over rice (naturally gluten-free). Check every packaged ingredient — bouillon, tamari, Worcestershire, spices, brown sugar, cornstarch — for wheat, barley, malt, rye, and cross-contact / shared-equipment warnings. Formulas change; the label in your kitchen is the one that counts.

Regular soy sauce, regular Worcestershire, and most grocery bouillon cubes are not gluten-free. A bottle that only says “wheat-free” without a gluten-free claim is not enough if you need this genuinely gluten-free.

Contains: beef, soy (tamari). Worcestershire, if you use it, often has anchovy. High sodium. Cornstarch slurry is optional and stays gluten-free if it’s plain cornstarch, not a gravy packet. Don’t call it takeout pepper steak from a wok — it’s a slow cooker.

Final Thoughts

Strips against the grain, thick peppers, tamari-bouillon sauce, low about 5 hours, rice on the side. If you wanted 8-hour pulled beef, that’s a different cut.