Creamy Crockpot Flank Steak with Peppers and Gruyère

This crockpot flank steak recipe is the ultimate set-and-forget dinner. Tender strips of beef, sweet bell peppers, and red onions simmer low and slow in a rich, creamy sauce made with cream cheese and nutty Gruyère.

The result is a hearty, comforting meal that feels indulgent but requires almost no effort. Serve it over toasted garlic brioche to soak up every last drop of the velvety gravy.

Slow cooker meals are a lifesaver on busy days, and this one is a true crowd-pleaser. The combination of flank steak, colorful peppers, and a luscious cheese sauce creates a dish that tastes like it took hours of attention—but it doesn't.

Just layer the ingredients in the crockpot, walk away, and come back to a bubbling, aromatic dinner ready to serve. Perfect for weeknight dinners or casual gatherings, this recipe is as versatile as it is delicious.

Ingredients

Why this recipe works

The slow cooker does all the work here, turning tough flank steak into fork-tender bites. The low, moist heat breaks down the connective tissue, so the meat becomes melt-in-your-mouth tender without any babysitting.

Meanwhile, the peppers and onions soften and sweeten as they cook, infusing the sauce with their natural juices.

Cream cheese and Gruyère melt into a silky, rich sauce that coats every strip of beef and vegetable. The cream cheese adds tang and body, while Gruyère brings a nutty, savory depth that elevates the dish.

Because the cheese melts slowly over hours, the sauce stays smooth and doesn't curdle, giving you a restaurant-quality result every time.

Notes and substitutions

Flank steak is the star here, but you can also use sirloin or skirt steak. Slice it thinly against the grain before cooking—this ensures it stays tender and easy to eat. For the best texture, avoid over-stirring the pot during cooking, as that can break up the meat too much.

Choose ripe but firm bell peppers and a sweet red onion for the best flavor. Gruyère is traditional, but Swiss or white cheddar make excellent substitutes if needed. For serving, any crusty bread or even rice or pasta would work, but toasted garlic brioche is the perfect vehicle for soaking up the creamy sauce.

• Gruyère cheese: Swiss cheese or white cheddar can replace Gruyère for a similar nutty, melty finish.
• flank steak: Sirloin steak or skirt steak works well; slice thinly against the grain.
• brioche: Crusty bread or garlic bread can stand in for brioche when serving.

Equipment

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