Slow Cooker Pepper Steak

This Slow Cooker Pepper Steak recipe is an easy comforting dinner that comes together so simply in the slow cooker! With tender peppers that still hold their shape plus fall apart beef strips and seasoned gravy.

We love cooler evenings because it means that easy meals like this Slow Cooker Pepper Steak are back on the table alongside Cheesy Garlic Bread Dippers. Comfort foods especially those that are healthy and nourish our bodies are my favorite kinds of meals!

Ingredients

Here is what I use for this recipe and you can adjust nuts or spices based on preference:

• Beef sirloin: Slice it against the grain into irregular thin strips so it becomes tender during slow cooking.
• Red bell pepper: Cut it into uneven strips for sweetness and bright color that remain visible in the finished dish.
• Green bell pepper: Cut it into uneven strips for a fresh savory flavor and a contrasting green color.
• Yellow onion: Slice it into loose wedges so it softens into the sauce while keeping a little structure.
• Garlic: Mince it finely so its flavor disperses throughout the savory cooking liquid.
• Beef broth: Use it as the main cooking liquid that tenderizes the beef and forms the base of the sauce.
• Low sodium soy sauce: Add it for deep savory flavor and balanced saltiness without overwhelming the peppers.
• Worcestershire sauce: Use it to add tangy depth and a subtle roasted flavor to the sauce.
• Brown sugar: Add it to round out the salty sauce with a mild caramel sweetness.
• Ground ginger: Use it for gentle warmth that complements the beef and peppers.
• Black pepper: Add it for mild heat and a peppery finish that supports the savory sauce.
• Cornstarch: Use two tablespoons to coat the beef and one tablespoon to thicken the sauce near the end.
• Cold water: Mix it with the reserved cornstarch to create a smooth slurry without lumps.
• Sliced green onions: Scatter them over the finished portion for fresh color and a light onion flavor.

Tools You’ll Need

• 6 quart slow cooker: Cooks the beef gently over several hours while softening the peppers and developing the savory sauce.
• Chef knife: Slices the beef against the grain and cuts the peppers and onion into irregular strips and wedges.
• Wooden cutting board: Provides a stable surface for cutting the beef and vegetables before they enter the slow cooker.
• Medium mixing bowl: Holds the beef while it is coated evenly with cornstarch and seasonings.
• Small mixing bowl: Combines the sauce ingredients and later mixes the cornstarch slurry until smooth.
• Measuring cups and spoons: Measures the broth and sauces and seasonings accurately for balanced flavor and texture.
• Whisk: Blends the sauce and slurry so the cornstarch disperses without visible lumps.
• White serving plate: Presents one finished portion while showing the glossy sauce and irregular pieces clearly.

Instructions

Step 1: Slice the beef and vegetables

Cut the 1 1/2 pounds of beef into thin irregular strips that vary slightly in length. Slice the red pepper and green pepper into loose uneven strips then cut the onion into casual wedges. The food changes from whole ingredients into bite sized pieces with natural spacing and slight overlap. Keep the beef separate from the vegetables at this stage.

Tip: Slice the beef against the grain so the long muscle fibers shorten and become tender after several hours of slow cooking.

Step 2: Coat the beef with cornstarch and spices

Transfer the sliced beef into a mixing bowl then scatter two tablespoons of cornstarch with the ground ginger and black pepper over the strips. Fold everything until the beef looks lightly dusty and unevenly coated. The beef changes from glossy red strips to a pale matte surface with a few visible patches of seasoning. The strips shift toward the center and overlap loosely after mixing.

Tip: Use only a thin coating so the beef stays tender and the sauce thickens gently instead of becoming pasty or heavy.

Step 3: Layer the beef and peppers with sauce

Place the coated beef strips across the bottom of the slow cooker crock then scatter the red pepper and green pepper strips with onion wedges over and between the beef. Pour the broth mixture with soy sauce and Worcestershire sauce plus brown sugar and garlic across the layers. The dry coated beef becomes wet and glossy while the vegetables remain partly exposed. The ingredients shift from separate groups into an uneven layered mixture with sauce collecting around the edges.

Tip: Keep some pepper strips above the liquid so they soften without disappearing completely into the sauce during cooking.

Step 4: Slow cook until the beef turns tender

Cook the layered mixture until the beef changes from red to deep brown and the pepper strips soften while still showing their colors. The onion wedges become translucent and the sauce begins to darken. The beef strips settle lower in the crock and shift into loose folds while the vegetables spread through the liquid. A few exposed beef edges show natural browning and the sauce remains slightly thin.

Tip: Check the beef near the end of cooking because lean sirloin can become dry when left much longer than needed.

Step 5: Thicken the pepper steak sauce

Stir one tablespoon of cornstarch with two tablespoons of cold water then fold the slurry into the hot pepper steak. Continue cooking until the sauce changes from thin and loose to glossy and thick enough to cling to the beef. The beef and vegetables shift from the edges toward the center as the mixture is stirred. The peppers overlap in new positions and the sauce coats them unevenly with a homemade finish.

Tip: Add the slurry near the end so the sauce becomes glossy and clingy without dulling the flavor or overcooking the peppers.

Step 6: Serve one pepper steak portion

Scoop one generous portion onto a white plate with several tender beef strips plus red and green pepper pieces and onion coated in the thick sauce. Scatter the sliced green onions unevenly over the top. The food transfers from the crock into a close serving arrangement that reveals glossy sauce and tender interiors. Keep the portion casual with irregular overlaps and visible browned beef edges.

Tip: Let the pepper steak rest for a few minutes before serving so the sauce settles and stays on each tender strip.

Pro Tips

• Slice the beef against the grain and keep the strips slightly uneven so they cook tender while still looking naturally homemade.
• Add the bell peppers in thick strips because thin pieces can soften too quickly and disappear into the sauce during long cooking.
• Use low sodium soy sauce so the savory flavor stays balanced after the liquid reduces and the sauce becomes more concentrated.
• Stir in the cornstarch slurry only near the end because early thickening can make the sauce cloudy and overly heavy.

Storage Instructions

Cool the Slow Cooker Pepper Steak before storing it so trapped steam does not create extra water in the sauce. Transfer portions into airtight containers within two hours of cooking. Refrigerate the pepper steak for up to four days. Keep each portion covered so the beef stays moist and the peppers do not absorb other refrigerator odors.

Freeze cooled portions for up to three months in freezer safe containers. Leave a little room at the top because the sauce expands as it freezes. Thaw frozen portions overnight in the refrigerator then reheat gently until steaming hot. Add a small splash of broth if the sauce becomes too thick during reheating.

Frequently Asked Questions

See You in the Kitchen

I hope you try this Slow Cooker Pepper Steak soon!

It is a simple recipe that looks beautiful and tastes incredible and makes every weeknight a little more special alongside Tomato Braised Fish.

Do not forget to share your results or save this recipe for later because it is one worth keeping with Chicken Bacon Ranch Pinwheels ready for your next party.

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