I’m serving up a crock pot pepper steak of impossibly tender, flavor-packed beef and vibrant bell peppers bathed in a glossy savory sauce you have to see to believe.

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I’m obsessed with this pepper steak because the thinly sliced flank steak soaks up that glossy, savory sauce and the bell peppers pop with bright crunch. I love how every bite balances rich beef with that snap of pepper.

And it never feels heavy. It’s one of those meals I crave after a long day, simple but wildly satisfying.

Juicy strips, vibrant peppers, and real depth of flavor. No frills.

Just bold taste that hits fast and keeps coming back for more. I make it on repeat, no regrets, no dishes left uncompromised.

Dinner win every single week, no contest.

Ingredients

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Flank steak or sirloin — tender protein, thin slices cook fast.
Red bell pepper adds sweet crunch and bright color.
Green bell pepper brings freshness and a little bite.
Yellow bell pepper gives sunny sweetness and pleasing texture.
Onion adds soft sweetness and caramelized depth when cooked.
Garlic brings warm, punchy aroma you’ll want more of.
Soy sauce gives salty umami, keeps things savory.
Oyster sauce adds rich, slightly sweet seafood depth.
Beef broth or water keeps sauce saucy and meaty.
Brown sugar balances salt with mellow sweet notes.
Worcestershire adds tangy, complex savory back notes.
Cornstarch makes the sauce glossy and clingy to ingredients.
Water slurry helps thicken without lumps, basically smooths things.
Vegetable oil is the neutral frying base, nothing fancy.
Sesame oil is optional but gives a toasty finish.
Black pepper adds heat and little smoky bite.
Salt seasons everything so flavors actually pop.
Red pepper flakes kick it up if you like heat.
Green onions garnish with fresh crunch and mild onion zing.

Ingredient Quantities

1 1/2 to 2 lbs flank steak or sirloin, thinly sliced

3 bell peppers (1 red, 1 green, 1 yellow), sliced

1 medium onion, thinly sliced

3 cloves garlic, minced

1/3 cup low sodium soy sauce

1/4 cup oyster sauce

1/4 cup beef broth or water

2 tbsp brown sugar

1 tbsp Worcestershire sauce

2 tbsp cornstarch

2 tbsp water for slurry

1 tbsp vegetable oil

1 tsp sesame oil (optional)

1/2 tsp black pepper

1/2 tsp salt, or to taste

1/4 tsp crushed red pepper flakes (optional)

2 green onions, sliced, for garnish

How to Make this

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1. Cut the steak into thin strips across the grain and toss with 1/2 tsp salt and 1/2 tsp black pepper; set aside.

2. Heat 1 tbsp vegetable oil in a skillet over medium-high heat and quickly brown the beef in batches, 1 to 2 minutes per side, just to get color; you dont need to cook through. Transfer browned strips to the crock pot.

3. In the same skillet add the sliced onion and minced garlic and cook 1 to 2 minutes until fragrant, scraping up browned bits, then add to the crock pot with the beef.

4. Add the sliced red, green, and yellow bell peppers to the crock pot.

5. Whisk together 1/3 cup low sodium soy sauce, 1/4 cup oyster sauce, 1/4 cup beef broth or water, 2 tbsp brown sugar, and 1 tbsp Worcestershire sauce; pour that over the beef and vegetables. Sprinkle in 1/4 tsp crushed red pepper flakes if you like heat.

6. Cover and cook on LOW for 6 to 8 hours or on HIGH for 3 to 4 hours, until beef is tender and peppers are softened but still slightly crisp.

7. About 15 minutes before serving, mix 2 tbsp cornstarch with 2 tbsp water to make a smooth slurry.

8. Stir the slurry into the crock pot, add 1 tsp sesame oil if using, then cover and let thicken for 10 to 15 minutes on HIGH or until sauce reaches the thickness you like. Taste and adjust salt or pepper if needed.

9. Give everything a final stir to coat the beef and peppers evenly with the glossy sauce.

10. Serve over rice or noodles, garnish with sliced green onions, and enjoy.

Equipment Needed

1. Large cutting board and sharp chef’s knife for slicing the steak and peppers
2. Measuring cups and spoons (1/3 cup, 1/4 cup, tbsp and tsp)
3. Large skillet or frying pan for browning beef and sweating onions
4. Crock pot or slow cooker (4 to 6 quart)
5. Wooden spoon or heatproof spatula for scraping browned bits and stirring
6. Small bowl and whisk or fork to mix the sauce and make the cornstarch slurry
7. Tongs or slotted spoon to transfer browned beef to the crock pot
8. Rice cooker or pot for cooking rice or noodles, plus a ladle to serve

FAQ

Q: How do I keep the steak tender and not chewy?

A: Slice very thin against the grain, marinate 15 to 30 minutes in the soy/oyster mix if you can, and cook fast over high heat — don’t overcrowd the pan. Let the steak rest a few minutes before serving. Overcooking is the #1 mistake.

Q: Can I use a different cut of beef?

A: Yes. Flank or sirloin are best for thin slicing. You can use skirt or hanger too. If you only have a thicker roast, slice it thin after chilling in the freezer 20 minutes so it cuts cleaner.

Q: How do I fix a sauce that’s too thin or too salty?

A: For thin sauce, stir in the cornstarch slurry (2 tbsp cornstarch + 2 tbsp water) and simmer until thick. If it’s too salty, add a little more water or beef broth and a pinch of sugar or extra brown sugar to balance it.

Q: Can I make this ahead or freeze it?

A: You can make the components ahead: slice meat and veggies and store separately in the fridge for a day. Cooked pepper steak keeps 3 to 4 days in the fridge. Freezing cooked pepper steak is ok but the peppers get softer when thawed.

Q: Any tips for the peppers so they stay crisp?

A: Cook peppers quickly over high heat and don’t over saute. Push them to the side and add the steak back in to finish so they dont go mushy. Using a hot pan and a bit of oil helps them char slightly while staying crisp.

Q: What should I serve it with?

A: Steamed rice or fried rice is classic. It also goes great over noodles, cauliflower rice for low carb, or wrapped in tortillas for a fun twist. Sprinkle sliced green onion and a drizzle of sesame oil for extra flavor.

Tender And Flavorful Pepper Steak Recipe Substitutions and Variations

Flank steak or sirloin: use skirt steak, hanger steak, or thinly sliced ribeye if you want more fat and flavor; for a veggie option try firm tofu or portobello strips, press them first so they dont get soggy.
Low sodium soy sauce: swap with tamari for gluten free cooking, or coconut aminos if you need soy free; both are a little sweeter so taste before adding more sugar.
Oyster sauce: replace with hoisin sauce or a mix of soy sauce plus a tsp of mushroom sauce for a similar umami punch; for vegan use mushroom stir fry sauce.
Cornstarch: use arrowroot powder 1:1 for a clearer glaze, or all purpose flour at about twice the amount if thats all youve got, but the sauce wont be as glossy.

Pro Tips

1) Slice the steak super thin and across the grain, not with it. Thinner strips cook faster and stay tender, so freeze the steak 20 minutes first if you need it firmer to slice. Dont over crowd the pan when browning or you’ll steam the meat and lose that nice caramelized flavor.

2) Brown quickly on high heat just to get color, then stop. You dont need to cook it through in the skillet. Those browned bits in the pan are gold, so scrape them into the slow cooker with the onions and garlic for extra depth.

3) Add the peppers later if you like them a bit crisp; if you want them softer, add ’em at the start. Different colors cook differently too, so cut the red a bit thicker if you want it to hang with the green and yellow.

4) Mix the cornstarch slurry cold, and whisk it in slowly at the end. If the sauce gets too stiff, thin with a splash of beef broth or water. Taste before adding more salt since soy and oyster sauces are salty already.