Slow Cooker Garlic Butter Beef

Section: Set It and Forget It - Easy Slow Cooker Meals

Garlic butter beef bites, slow-simmered for hours, create fall-apart tender meat with a silky, savory sauce. Searing the sirloin first deepens the flavor, while a rich blend of beef stock, sweet onions, and fresh garlic infuses the bites with mouthwatering aromas. Finished with a pat of unsalted butter and a hint of au jus gravy mix, this dish brings satisfying comfort and easy weeknight elegance. Serve over mashed potatoes, rice, or noodles for a family-friendly meal that gets even better as leftovers.

A woman wearing a chef's hat and apron.
Brought to You By iman
Last updated on Tue, 16 Sep 2025 14:02:36 GMT
A bowl of slow cooker garlic butter beef bites. Bookmark
A bowl of slow cooker garlic butter beef bites. | imaninthekitchen.com

Slow cooker garlic butter beef bites have become that dish my family always requests for Sunday dinners or cozy weeknights. The beauty here is how a few simple ingredients turn ordinary beef into something extra special with nearly hands-off cooking. As chunks of sirloin slowly soak up garlicky butter and rich jus in your slow cooker, your whole kitchen fills with a savory aroma that signals true comfort food is on the way. You will love how this easy recipe delivers restaurant-worthy flavor and tenderness every time.

I first made this for my grandchildren on a rainy Sunday and they hovered around, noses in the air, waiting for a taste. Now they cheer when I mention beef bites night and always come back for seconds.

Ingredients

  • Sirloin steak: is my top choice because it turns buttery soft in the slow cooker and still keeps a hearty bite. It is affordable and cooks up beautifully
  • Kosher salt and black pepper: truly matter for building a deep savory base. Kosher salt seasons more evenly than table salt for this kind of braise
  • Vegetable oil: is key for getting a deep golden sear on the beef at the start which brings out the best flavor of your meat
  • Sweet onion: balances everything with gentle sweetness. Picking a firm onion free of spots always means fresher flavor
  • Fresh garlic cloves: provide clear depth. Always use whole cloves that are plump and fragrant rather than pre-chopped
  • Beef stock: forms the body of your sauce. Choose unsalted so you really have control over seasonings in the end
  • Au jus gravy mix: thickens and adds deep savory character. Look for a low sodium one if you want extra control
  • Unsalted butter: smooths and enriches the finished dish. Look for a pale yellow block with a faint sweet smell

Instructions

Season the Beef:
Start by patting the beef pieces dry and sprinkle kosher salt and pepper all over each piece. Make sure every side gets a quick toss for even flavor penetration as it cooks
Sear the Beef:
Heat a heavy skillet over medium high until it feels hot when you hover your hand over it. Pour in vegetable oil and lay beef chunks spaced out so they all sear and not steam. Sear in batches for deep browning on all sides. This step makes a big difference in both color and flavor
Layer Flavors in the Slow Cooker:
Move all seared beef to the base of your slow cooker. Scatter sliced onion and smashed garlic evenly around and between the meat chunks. This ensures both sweetness and aroma touch every bite
Add Liquid and Seasoning:
Pour beef stock gently over the beef mixture so you do not disturb the seared crust. Sprinkle the au jus gravy mix evenly across the top to dissolve smoothly as it heats
Finish with Butter:
Dot the top of everything with thin slices of butter. The melting butter creates a silky sauce and helps the flavors meld perfectly
Slow Cook to Tender:
Set your slow cooker on low for 5 to 7 hours or high for around 3 and a half hours. Check occasionally if you can and stir gently once per hour to spread all that flavor
Check for Doneness:
Your beef is ready when it pulls apart easily with a fork and the sauce clings to every piece. Give it a quick taste and adjust salt or pepper if needed before serving
Cool and Serve:
Let the beef bites settle for a few minutes before spooning them out over mashed potatoes or rice. Allowing them to rest helps the sauce thicken up even more
A bowl of meat and potatoes.
A bowl of meat and potatoes. | imaninthekitchen.com

My absolute favorite thing here is the sweet onion that turns meltingly soft and flavors every bite of beef. It always reminds me of my grandma’s Sunday lunches when the slow cooker would run quietly in the corner while we played cards together. The aroma meant something delicious was waiting and I still feel that comfort every time I make this for my own family now.

How to Store Slow Cooker Garlic Butter Beef Bites

Transfer cooled beef and sauce into airtight containers and place them in the refrigerator where they stay tasty for up to four days. When freezing, I like to portion out servings in freezer bags with the air pressed out and lay them flat so they thaw quickly. Label with the date and try to use within three months for best quality. For reheating, the stovetop over low heat keeps the sauce smooth. If you need to thin things out after chilling, stir in a little extra beef stock.

Ingredient Swaps and Easy Substitutions

Chuck roast works nicely if you do not have sirloin. Choose the leanest cut you can and trim away most fat. Yellow onion is a good stand in for sweet onion for a slightly more assertive flavor. Olive oil works instead of vegetable oil if you prefer it on hand. If you want a lower sodium dish use homemade beef stock and a reduced sodium au jus packet.

Serving Ideas to Enjoy with Beef Bites

Spoon beef and gravy over a mountain of buttery mashed potatoes for the ultimate comfort meal. Try fluffy white or brown rice if you want to soak up every drop of sauce. Pile on toasted sourdough bread as an open face hot beef sandwich. Pair with crisp steamed green beans or roasted root veggies for balance.

Cultural and Seasonal Background

Slow-cooked beef dishes like this one have long roots in Midwestern kitchens where big family dinners are a tradition. The method stretches budget cuts of beef into tender feasts perfect for cold months. I save this recipe for fall and winter when everyone wants something extra cozy.

Seasonal Tips

Slow cooker beef bites taste even richer with a splash of red wine added during holiday meals. Try adding baby carrots for color or peas at the very end for spring freshness. In summer I serve leftovers cold as filling for beef wraps or over crisp salad greens.

Recipe Success Stories

Friends tell me these beef bites are always a hit at potlucks since they hold perfectly in a warm slow cooker. One cousin brings it to family reunions and says she never takes home leftovers. Readers often report that even picky eaters go back for thirds. Sharing this at family gatherings has become a new tradition in our home.

How to Make This Recipe for the Freezer

Prepare the whole dish through cooking and cool completely. Separate into meal-size containers or sturdy zip bags and freeze flat for a speedy defrost. To reheat thaw in the fridge overnight then gently warm on a stovetop or low in the slow cooker to keep everything tasting freshly made.

A bowl of meat and potatoes.
A bowl of meat and potatoes. | imaninthekitchen.com

Enjoy sharing these flavorful beef bites with your family and friends. The slow cooker does all the work, making this recipe a new favorite for comfort food lovers.

Common Questions About the Recipe

→ What type of beef works best?

Sirloin steak is ideal, becoming tender and flavorful with slow cooking. Chuck roast can also be used.

→ Can I sear the beef in advance?

Yes, searing ahead locks in flavor and can be done the night before for quick assembly the next day.

→ How do I thicken the sauce?

Let the sauce reduce with the lid off at the end, or stir in a cornstarch slurry for a thicker consistency.

→ Are leftovers freezer-friendly?

Absolutely! Cool completely and store in freezer bags for up to 3 months. Reheat gently for best texture.

→ What are serving suggestions?

Serve over mashed potatoes, rice, or egg noodles. Roasted vegetables and a side salad complement nicely.

Slow Cooker Garlic Butter Beef

Sirloin becomes extra tender in a garlic butter sauce—perfect over mashed potatoes, rice, or noodles.

Prep Time
20 minutes
Cooking Time
360 minutes
Total Time
380 minutes
Brought to You By: iman

Recipe Category: Slow Cooker Recipes

Skill Level: Great for Beginners

Cuisine Origin: American

Portions: 6 Serves (approximately 6 cups cooked beef bites with sauce)

Diet Preferences: ~

What You'll Need

→ Main Ingredients

01 2 pounds sirloin steak, cut into 1-inch cubes
02 1 teaspoon kosher salt
03 1/2 teaspoon freshly ground black pepper
04 2 tablespoons vegetable oil

→ Aromatics & Sauce

05 1 large sweet onion, thinly sliced
06 4 cloves fresh garlic, finely minced
07 1 cup unsalted beef stock
08 1 packet au jus gravy mix (about 1 ounce)
09 6 tablespoons unsalted butter, cut into pieces

Steps to Follow

Step 01

Evenly coat sirloin steak pieces with kosher salt and black pepper.

Step 02

Heat vegetable oil in a large skillet over medium-high heat. Once hot, sear beef cubes in batches until browned on all sides, avoiding overcrowding to ensure proper caramelization.

Step 03

Transfer seared beef to the slow cooker. Add sliced sweet onion and minced garlic, distributing them evenly.

Step 04

Pour unsalted beef stock gently over the beef mixture. Sprinkle au jus gravy mix evenly across the surface.

Step 05

Distribute unsalted butter pieces across the top of the assembled ingredients.

Step 06

Cover and cook on low for 6 hours, or until beef is fork-tender. Stir once per hour if possible for even flavor distribution.

Step 07

Test for doneness by checking if beef shreds easily with a fork. Serve hot over mashed potatoes, rice, or noodles.

Additional Notes

  1. For optimal searing, ensure skillet is fully hot before adding oil and do not overcrowd the pan.
  2. Storing leftovers in airtight containers in the refrigerator up to 3-4 days enhances flavor development.
  3. Freeze in portions for up to 3 months; reheat gently on the stovetop to retain sauce consistency.

Must-Have Tools

  • Large skillet
  • Slow cooker
  • Chef's knife
  • Cutting board
  • Measuring cups and spoons

Allergy Details

Always inspect ingredient packaging for allergens, and consult a healthcare provider if you're unsure.
  • Contains dairy (butter).
  • Contains gluten (au jus gravy mix may contain wheat).

Nutritional Details (Per Portion)

Nutritional info is purely informational and not a substitute for medical advice.
  • Calories: 395
  • Fats: 28 g
  • Carbohydrates: 5 g
  • Proteins: 32 g