
These Slow Cooker Garlic Butter Steak Bites are the answer when you crave bold flavor and melt-in-your-mouth beef without fussing over the stove. Perfect for busy weeknights or low-key gatherings this hands-off meal fills the kitchen with comforting smells and delivers steakhouse taste with minimal effort.
I made these for a game day and everyone hovered around the slow cooker. They vanished faster than any other dish on the table and now I make double batches for leftovers.
Ingredients
- Sirloin steak: the star for its tender texture and hearty flavor choose well-marbled pieces at the butcher
- Kosher salt: boosts the natural savoriness of the meat opt for flaky high quality salt for best results
- Black pepper: gives gentle heat and balances the butter grind fresh if possible for brighter flavor
- Vegetable oil: helps create a golden crust when searing use a neutral kind like canola or grapeseed
- Sweet onion: pairs with the garlic to give subtle sweetness pick onions that feel heavy and firm
- Garlic: rounds out the dish with aromatic kick fresh cloves are a must for full flavor
- Unsalted beef stock: adds moisture and depth look for low sodium to keep salt control in your hands
- Au jus gravy mix: infuses the dish with rich umami check labels for one without too many additives
- Unsalted butter: creates a creamy finish and signature garlic butter taste use real butter sliced thin so it melts evenly
Step-by-Step Instructions
- Prep the Steak:
- Pat sirloin steak dry with paper towels and trim off any excess fat. Cut into bite-sized chunks. Season generously with kosher salt and black pepper then toss well so each piece is coated.
- Brown the Meat:
- Heat your skillet over medium-high until it is nearly smoking. Add a tablespoon of oil then arrange steak pieces in a single layer. Sear for two minutes per side until well browned. Work in batches if needed to avoid overcrowding refilling the oil if the pan dries out.
- Fill the Slow Cooker:
- Transfer all browned steak cubes into the bottom of a six-quart slow cooker. Scatter sliced onion and garlic over the top making sure to distribute evenly.
- Add Liquid and Flavor:
- Pour beef stock around the edges to keep the seared crust intact. Sprinkle gravy mix evenly to avoid clumping then lay butter slices over the whole surface.
- Let it Cook:
- Secure the lid and set to high for four hours or low for up to eight hours. Stir once every hour if you are home so the flavors meld and prevent sticking.
- Serve and Enjoy:
- Spoon the buttery steak bites over creamy mashed potatoes fluffy rice or egg noodles. Drizzle with some of the slow cooker juices.

The way butter melts into the gravy and steak always brings me back to my first taste. My husband likes to sneak a spoonful straight from the slow cooker before dinner is even served the whole kitchen smells like a steakhouse on a cozy night in.
Storage tips
Keep any leftovers in a tightly sealed container in the refrigerator for up to four days. The flavors will intensify over time and the beef stays tender when reheated gently on the stove or in the microwave. For longer storage freeze portions in resealable bags and thaw overnight before gently warming with a splash of broth.
Ingredient substitutions
Chuck roast or stew beef is a good swap for sirloin if you want a more budget-friendly option just extend the cooking time to make sure the meat gets tender. If you have just salted butter reduce the added salt. For a dairy-free twist you can try using vegan butter and vegetable stock though the classic richness may be lighter.
Serving suggestions
I love to pile these steak bites on a bed of egg noodles or mashed potatoes with a side of crisp green beans. For a party dish serve with toothpicks right out of the slow cooker and offer warm rolls to soak up the garlicky sauce. A sprinkle of fresh parsley adds color and freshness.

Cultural and historical context
Slow cooking beef in a flavorful liquid goes way back in American homestyle cooking. This garlic butter twist takes inspiration from steakhouse classics where garlic butter is brushed onto sizzling beef. The slow cooker helps even budget cuts become fork tender just like grandma’s roasts but with a modern shortcut.
Frequently Asked Questions
- → What cut of steak is best for this dish?
Sirloin steak works wonderfully as it becomes tender and absorbs the garlic butter flavors during slow cooking.
- → Is it necessary to sear the steak pieces first?
Searing adds flavor and color, enhancing the finished taste, but you can skip it for quicker preparation if needed.
- → Can I substitute the au jus gravy mix?
Yes, you can use a similar dry gravy mix or even beef bouillon for a flavorful result.
- → What side dishes go well with these steak bites?
Mashed potatoes, egg noodles, or steamed rice complement the buttery steak beautifully.
- → How do I store leftovers?
Refrigerate in an airtight container for up to three days. Reheat gently to preserve tenderness.