Crockpot Garlic Butter Steak Bites: 5-Hour Set-and-Forget Dinner

This is the slow-cooker dinner that does the heavy lifting while you go about your day. Cubes of top sirloin simmer for five hours in a golden bath of melted butter, minced garlic, dry onion soup mix, and beef au jus until they are so tender they practically fall apart. The result is a rich, savory dish that tastes like a steakhouse special but requires just ten minutes of prep.

Slow cookers are the ultimate set-and-forget tool, and this recipe puts them to perfect use. You start with top sirloin, a lean but flavorful cut, and let it cook low and slow in a buttery, garlicky liquid that transforms it into fork-tender bites.

The onion soup mix adds depth and a touch of savoriness, while the beef au jus creates a silky sauce. After five hours, you have a dinner that tastes like you spent all day tending the stove—but you only spent ten minutes tossing ingredients into the Crockpot.

Ingredients

Why this recipe works

The magic of this recipe lies in the low-and-slow cooking method. Top sirloin is a relatively lean cut, but when cooked gently in a slow cooker, the connective tissue breaks down and the meat becomes incredibly tender.

The butter and au jus create a rich, flavorful liquid that keeps the beef moist and infuses every cube with garlic and onion notes. This is the same principle behind braising, but the slow cooker makes it completely hands-off.

The combination of dry onion soup mix and beef au jus is a flavor powerhouse. The onion soup mix brings a concentrated, savory onion flavor with a hint of herbs, while the au jus adds a deep, beefy richness. The butter ties it all together, creating a silky sauce that coats the steak bites beautifully. This is a simple ingredient list that delivers complex, satisfying results.

Notes and substitutions

Top sirloin is the star here, but you can also use chuck roast or round steak, which become even more tender with long cooking. Cut the beef into uniform 1 1/2-inch cubes so they cook evenly.

If you prefer a leaner dish, trim excess fat, but a little marbling adds flavor and moisture. The dry onion soup mix is a pantry staple; if you don't have it, you can substitute a mix of onion powder, dried minced onion, and salt.

Salted butter is used here because it seasons the sauce as it melts. If you only have unsalted, add a pinch of salt to the slow cooker.

Beef au jus is available in jars or packets in most supermarkets; you can also use low-sodium beef broth with a splash of Worcestershire sauce. The recipe is forgiving—adjust the garlic to your taste, and feel free to add a pinch of red pepper flakes for heat.

• top sirloin steak: chuck roast or round steak, cut into 1 1/2-inch cubes (will be even more tender after slow cooking)
• beef au jus: low-sodium beef broth mixed with 1 teaspoon Worcestershire sauce
• dry onion soup mix: 1 tablespoon onion powder plus 1 teaspoon dried minced onion and 1/2 teaspoon salt
• salted butter: unsalted butter plus 1/2 teaspoon salt

Equipment

• 6-quart slow cooker
• Slotted spoon
• Cutting board
• Chef's knife
• Measuring cups
• Measuring spoons