Cowboy Butter Broccoli Sirloin Tips: 5-Ingredient Crockpot Dinner

This Crockpot dinner is the definition of set-it-and-forget-it. Tender sirloin steak tips, fresh broccoli, and earthy mushrooms cook low and slow in a rich, savory garlic-herb butter au jus.

The result is a deeply satisfying meal that tastes like you spent hours in the kitchen—but it comes together in just 5 minutes of prep. Serve it over creamy mashed potatoes for a complete, comforting dinner that the whole family will love.

There are slow cooker recipes that require browning, layering, and fussing, and then there are dump-and-go dinners like this one. With just five ingredients and a single slow cooker, you can have a restaurant-quality meal on the table with almost no effort.

The sirloin tips become fork-tender, the broccoli soaks up the buttery gravy, and the mushrooms add a savory depth that makes this dish taste far more complex than it is. It's the kind of recipe you'll turn to on busy weeknights when you want something hearty and delicious without the cleanup.

Ingredients

Why this recipe works

The magic of this recipe lies in the slow, gentle cooking. Sirloin steak tips, when cooked low and slow, break down their connective tissue and become incredibly tender.

The low heat also allows the garlic-herb butter to melt slowly, infusing the meat and vegetables with rich flavor without the risk of burning. The au jus mix dissolves into the accumulated juices, creating a silky, savory gravy that clings to every bite.

The layering of ingredients is deliberate. The beef sits on the bottom, where it's closest to the heat source, ensuring it cooks through properly. The broccoli and mushrooms are placed on top, where they steam gently and retain a slight bite rather than turning to mush. The butter and au jus are added last, so they melt and drip down through the layers, seasoning everything evenly as the slow cooker works its magic.

Notes and substitutions

For the best results, use high-quality sirloin steak tips—look for pieces that are already cut into bite-size chunks. If you can't find them, you can cut a sirloin steak into 1-inch cubes. The broccoli should be fresh, not frozen, as frozen florets can become waterlogged and mushy during the long cook time. Baby bella mushrooms are preferred for their deeper flavor, but white button mushrooms will also work.

Garlic-herb cowboy butter is a compound butter that's available in many grocery stores, but you can also make your own by mixing softened butter with minced garlic, parsley, and a pinch of salt.

If you don't have au jus mix, a packet of beefy onion soup mix can be substituted, though you may want to reduce the amount slightly to control the saltiness. Serve over mashed potatoes, rice, or egg noodles to soak up the delicious gravy.

• sirloin steak tips: chuck roast cut into 1-inch cubes (cook low 6-8 hours)
• garlic-herb cowboy butter: 4 tbsp unsalted butter mixed with 2 tsp garlic powder and 1 tsp dried parsley
• au jus mix: 1 packet beefy onion soup mix (reduce salt if sensitive)

Equipment

• 6-quart slow cooker
• Measuring cups
• Measuring spoons
• Sharp knife
• Cutting board
• Serving spoon