Sour Cream Green Bean Flank Steak Crockpot Dinner

This Crockpot dinner is the definition of set-it-and-forget-it comfort food. Thin strips of flank steak, green beans, and russet potatoes simmer low and slow in a velvety sour cream gravy until everything is fork-tender.

The result is a rich, savory meal that tastes like you fussed for hours—but it comes together in just minutes of prep. Serve it over buttered egg noodles for a hearty, satisfying dinner that the whole family will love.

This slow cooker recipe takes a classic beef stroganoff vibe and gives it a rustic, one-pot twist. You simply layer flank steak, green beans, and potatoes in the Crockpot, dollop sour cream on top, and sprinkle with brown gravy mix.

Then you cover it and walk away. Hours later, you return to a bubbling pot of tender beef and vegetables in a silky, mahogany gravy. It's the kind of meal that makes weeknight dinners feel special without any fuss.

Ingredients

Why this recipe works

Slow cooking is the secret to turning an economical cut like flank steak into meltingly tender bites. The low, moist heat breaks down the connective tissue in the meat, so it becomes fork-tender after hours of gentle simmering. The potatoes and green beans cook in the same flavorful juices, absorbing the savory gravy as they soften.

The sour cream and brown gravy mix create a rich, tangy sauce without any extra steps. As the slow cooker works its magic, the sour cream mellows and blends with the gravy mix to form a velvety coating for every ingredient.

The layers stay separate during cooking, so each component retains its own texture, then come together with a quick stir at the end.

Notes and substitutions

Flank steak is ideal here because it becomes incredibly tender with long, slow cooking. If you prefer, you can use sirloin or round steak, but adjust the cooking time accordingly—leaner cuts may cook faster.

Green beans should be fresh and trimmed; frozen beans will work but may be softer. Russet potatoes hold up well, but Yukon Golds are also excellent.

The brown gravy mix is the flavor backbone, so choose a good-quality brand. If you're avoiding gluten, use a gluten-free gravy mix. The sour cream adds richness and a slight tang; full-fat sour cream yields the best texture, but reduced-fat works in a pinch. Serve over buttered egg noodles, rice, or mashed potatoes.

• flank steak: sirloin or round steak, thinly sliced
• fresh green beans: frozen green beans (thawed) or canned (drained)
• russet potatoes: Yukon Gold or red potatoes, cubed
• brown gravy mix: 1 tablespoon Worcestershire sauce plus 1 cup beef broth (reduce sour cream to 3/4 cup)

Equipment

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