Slow cooker beef and broccoli is one of those dinners that feels like takeout night—without actually ordering takeout.
With just a few pantry staples and thinly sliced beef, you’re on your way to something seriously satisfying.
Most of the work is done in the first 15 minutes.
After that, the slow cooker handles everything, transforming the beef into melt-in-your-mouth tender bites coated in a rich, savory sauce.
By the time dinner rolls around, you’ll have glossy, saucy beef and perfectly crisp-tender broccoli ready to spoon over a bowl of warm rice.
It’s simple, comforting, and guaranteed to earn a repeat spot on your weekly menu.
For Slow Cooker Beef and Broccoli
- Top Sirloin Steak – sliced very thin so it becomes tender and flavorful as it cooks low and slow in the sauce.
- Salt – just enough to season the beef before it goes into the slow cooker.
- Broccoli Florets – added at the end so they steam to crisp-tender perfection right in the crockpot.
For the Sauce
- Low Sodium Beef Broth – forms the savory base of the sauce without making it overly salty.
- Light Brown Sugar – adds sweetness to balance the salty and savory flavors.
- Low Sodium Soy Sauce – brings that classic deep, umami flavor.
- Oyster Sauce – adds richness and depth you can’t quite replicate with anything else.
- Cornstarch – thickens the sauce so it coats every piece of beef beautifully.
- Rice Vinegar – enhances the overall flavor and adds subtle complexity.
- Toasted Sesame Oil – gives the dish its signature nutty aroma.
- Asian Chili Sauce (Sambal Oelek) – adds a gentle kick of heat (adjust to your preference).
- Garlic – delivers bold, savory flavor throughout the sauce.
- Fresh Ginger – adds warmth and brightness that makes the sauce pop.
- Pepper & Onion Powder – simple seasonings that round everything out.
Easy Slow Cooker Beef and Broccoli Recipe
Notes
Ingredients
Beef and Broccoli
- 2 lbs. top sirloin steak, sliced into very thin 2” strips
- 1/2 teaspoon salt
- 5 cups (12 oz.) broccoli florets, chopped into bite-size pieces
Sauce
- 1 cup low sodium beef broth
- 1/3 cup packed light brown sugar
- 1/4 cup low sodium soy sauce
- 1/4 cup oyster sauce
- 3 tablespoons cornstarch
- 2 tablespoons rice vinegar
- ½–1 teaspoon sugar
- 1 tablespoon toasted sesame oil
- 1–3 teaspoons Asian chili sauce (I use sambal oelek)
- 4–6 cloves garlic, minced (or 1–1 ¼ teaspoon garlic powder)
- 1 tablespoon freshly grated ginger (or 1 teaspoon ground ginger)
- 1/2 teaspoon EACH pepper and onion powder
Instructions
- While the beef is still on the cutting board, pat it dry and toss with ½ teaspoon salt. Set aside.
- In the slow cooker, combine all sauce ingredients. Whisk until the cornstarch is fully dissolved. Add the beef and stir to coat. Cover and cook on LOW for 3–4 hours, or until the meat is very tender.
- Once the beef is tender, you may thicken the sauce further on the stovetop (recommended) or leave it as is. To thicken: carefully tilt the slow cooker (using an oven mitt) and ladle as much sauce as possible into a saucepan. Set aside.
- Add the broccoli on top of the beef in the slow cooker. Do not stir—allow it to steam over the meat. Cover and cook an additional 20–30 minutes, until the broccoli reaches your preferred crisp-tender texture.
- Meanwhile, simmer the reserved sauce on the stove until it becomes quite thick. Aim for a consistency slightly thicker than desired, as it will loosen once combined with the broccoli.
- Pour the thickened sauce back into the slow cooker and stir everything together. Serve over rice and garnish with sesame seeds and green onions if desired.
Notes & Helpful Tips
- For thin slices: Place the steak in the freezer for 30 minutes before cutting. This makes it easier to slice very thinly.
- Oyster sauce alternative: If avoiding shellfish, substitute with LEE KUM KEE Vegetarian Stir-Fry Sauce.
- Ingredient quality: Choose a good-quality oyster sauce for the best flavor.
- Alternate broccoli method: Steam broccoli separately in a microwave-safe bowl with about 1/8-inch of water. Cover and microwave on high for 2–3 minutes until crisp-tender.
- Vegetable swaps: You may replace or supplement the broccoli with other vegetables. Most (except carrots) require only 20–30 minutes in the slow cooker.
- Sauce thickening is optional: The sauce will thicken slightly during cooking but may thin once broccoli is added. Simmering on the stove creates a thicker, richer consistency.
- Avoid overcooking broccoli: It should remain crisp-tender, similar to stir-fry vegetables.
- If beef isn’t tender: Continue cooking. Even an additional 30 minutes can significantly improve texture.
Storage & Reheating
- To store: Place leftovers in an airtight container and refrigerate for up to 5 days.
- To reheat in the microwave: Heat individual portions for 1 minute, stir, then continue in 30-second intervals until warmed through.
- To reheat on the stove: Warm larger amounts gently in a skillet over medium-low heat, stirring frequently.
1. Can I Use a Different Cut of Beef?
Yes! While top sirloin works beautifully, you can also use flank steak or chuck steak.
The most important tip is to slice the beef very thin and cut against the grain. This helps it become extra tender as it cooks low and slow.
2. Do I Have to Thicken the Sauce on the Stove?
No, it’s optional. The sauce will naturally thicken a little in the slow cooker.
If you love that rich, glossy takeout-style sauce that coats every bite, simmering it on the stove for a few minutes makes a big difference.
3. Can I Use Frozen Broccoli?
Fresh broccoli gives the best texture, but frozen can work in a pinch.
If using frozen, add it at the very end and cook just until heated through so it doesn’t become too soft.
4. Can I Prep This Ahead of Time?
Absolutely! You can slice the beef and whisk together the sauce ingredients the night before.
Store them separately in the refrigerator, then combine everything in the slow cooker the next day for an easy start.
5. What If My Beef Isn’t Tender Yet?
Don’t worry — it likely just needs more time.
Slow cookers can vary, and even an extra 30 minutes can transform the texture. Keep cooking on LOW until the beef is melt-in-your-mouth tender.