Sour Cream Broccoli Flank Steak: Easy Crockpot Dinner

This Crockpot sour cream broccoli flank steak is the ultimate set-it-and-forget-it dinner. Tender strips of flank steak, fresh broccoli, and mushrooms cook low and slow in a rich, tangy sour cream gravy.

Serve it over buttered egg noodles for a comforting meal that tastes like you fussed—but it takes just minutes of prep.

Dump the ingredients into the slow cooker, walk away, and come back to a bubbling pot of savory goodness. The beef becomes meltingly tender, the broccoli absorbs the creamy sauce, and the mushrooms add an earthy depth. It's the kind of dinner that makes weeknights feel special without any effort.

Ingredients

Why this recipe works

Slow cooking transforms inexpensive flank steak into fork-tender morsels. The low heat gently breaks down the connective tissue, so the meat becomes beautifully tender while staying juicy.

The sour cream and gravy mix create a velvety sauce that coats every bite, while the broccoli and mushrooms cook just enough to soften without turning to mush.

The dump-and-go method means no browning, no layering, no fuss. Everything goes into the same pot, and the slow cooker does the work.

The result is a cohesive, deeply flavorful dish that tastes like it simmered all day—because it did. The gravy thickens naturally as it cooks, clinging to the beef and vegetables for a satisfying, hearty meal.

Notes and substitutions

Flank steak is ideal because it's lean, affordable, and becomes tender with slow cooking. Slice it thin against the grain to ensure tenderness. If you prefer, use sirloin or chuck roast. Broccoli florets and baby bella mushrooms are classic, but you can swap in cauliflower or green beans if you like.

Brown gravy mix adds savory depth and helps thicken the sauce. If you don't have it, use a tablespoon of flour whisked with a cup of beef broth.

Sour cream is essential for the tangy, creamy texture; use full-fat for the best flavor. For a lighter version, use Greek yogurt, but expect a slightly different taste.

• flank steak: sirloin steak or chuck roast, thinly sliced
• broccoli florets: cauliflower florets or green beans
• baby bella mushrooms: white button mushrooms or cremini
• brown gravy mix: 1 tbsp all-purpose flour plus 1 cup beef broth

Equipment

• 7-quart slow cooker
• Large skillet or pot for noodles
• Cutting board
• Chef's knife
• Measuring cups and spoons
• Serving spoon