Name: Slow-Cooked Sirloin Bites
Prep time: 15 min
Cook time: 4 h
Total time: 4 h 15 min
Cuisine: American
Ingredients: 2 lbs sirloin steak, cut into bite-sized pieces; 1 tsp kosher salt; ½ tsp black pepper; 1 tbsp olive oil; 1 sweet onion, thinly sliced; 3 garlic cloves, thinly sliced; 1 ½ cups unsalted beef stock or broth; 1 packet au jus gravy mix; 4 tbsp unsalted butter, sliced; Optional: fresh chopped parsley for garnish

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These Slow-Cooked Sirloin Bites are a comforting classic that I turn to when I need something hearty, flavorful, and fuss-free. With tender bites of sirloin simmered in a buttery, beefy gravy, this dish transforms everyday ingredients into a rich, melt-in-your-mouth meal. It’s the perfect solution for busy weeknights, chilly evenings, or when I simply want something that feels like a warm hug in a bowl.

Why You’ll Love This Recipe

I love how the slow cooker does all the heavy lifting here. I can prep everything in under 15 minutes, and then just let time work its magic. The sirloin becomes incredibly tender, the au jus and butter blend into a velvety sauce, and the aroma fills the kitchen long before dinner’s ready. It’s versatile, economical, and makes amazing leftovers.

ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

Sirloin steak, cut into bite-sized pieces
Kosher salt
Ground black pepper
Olive oil
Sweet onion, thinly sliced
Garlic cloves, thinly sliced
Unsalted beef stock or broth
Au jus gravy mix (1 packet)
Unsalted butter, sliced
Optional: Fresh chopped parsley for garnish

directions

I start by seasoning the sirloin pieces with salt and pepper.
I heat a skillet over medium-high heat, add olive oil, and sear the steak in batches until browned. Then I transfer them to a 6-quart slow cooker.
I add the onion and garlic to the slow cooker, scattering them over the beef.
I pour in the beef stock, sprinkle the au jus mix evenly, and place the butter slices on top.
I cover and cook on LOW for 6–8 hours or HIGH for 3–4 hours, stirring every 30 minutes if I can.
When it’s done, I sprinkle fresh parsley over the top and serve it hot with my favorite side dishes.

Servings and timing

This recipe serves 6 people and takes about 4 hours 15 minutes total—15 minutes of prep and 3–4 hours in the slow cooker.

Variations

Use Chuck Roast or Stew Meat: If I’m out of sirloin, I use chuck roast for a slightly longer cook time.
Thicken the Gravy: I mix 1 tablespoon cornstarch with 2 tablespoons cold water and stir it in during the last 30 minutes for a thicker gravy.
Add Veggies: I’ve tossed in mushrooms, baby carrots, or even pearl onions for more depth and heartiness.
Spicy Kick: A pinch of red pepper flakes or a splash of Worcestershire adds a punch of flavor.
Wine Base: I sometimes swap 1/4 cup of broth for red wine to give the sauce a deeper, more robust flavor.

storage/reheating

I store leftovers in an airtight container in the fridge for up to 4 days. They reheat beautifully in a skillet with a splash of broth to loosen the sauce. I also freeze them in portion-sized containers for up to 3 months—perfect for quick meals later on.

FAQs

Can I use a different cut of meat?

Yes, chuck roast or stew beef both work well. I just allow a bit more time on the low setting to make sure it’s fork-tender.

How do I thicken the sauce?

I stir in a cornstarch slurry (1 tablespoon cornstarch + 2 tablespoons water) during the last 30 minutes of cooking for a thicker, glossy gravy.

Can I prep everything the night before?

Definitely. I assemble everything in the slow cooker insert, cover, and refrigerate overnight. I start cooking the next morning.

Is this recipe freezer-friendly?

Yes. I freeze it after it cools, either in individual portions or as a whole batch. I thaw overnight and reheat gently on the stove or in the microwave.

What if I don’t have au jus gravy mix?

I substitute with a teaspoon of beef bouillon and a teaspoon of cornstarch. It still delivers rich flavor and a great texture.

Conclusion

These Slow-Cooked Sirloin Bites are a total win in my kitchen—rich, buttery, and irresistibly tender. It’s one of those easy slow cooker beef recipes that fits into any schedule and still feels like a special meal. Whether I serve it over mashed potatoes or pile it into a hoagie roll for steak sandwiches, this tender beef dinner always hits the mark.