Melt-in-Your-Mouth Slow Cooker Flank Steak with Rich Mushroom Gravy

Indulge in the ultimate comfort food with our incredible slow cooker flank steak recipe, generously smothered in a rich, savory mushroom gravy. This high-protein, incredibly tender dinner practically melts in your mouth, promising a truly unforgettable meal. If you enjoyed our air fryer flank steak, prepare to fall in love with this effortless Crockpot version, designed for maximum flavor with minimal fuss.

This meal is truly a culinary delight, perfect for busy individuals and families alike. There’s nothing quite like the convenience of setting your Crockpot in the morning and returning home to a house filled with the inviting aroma of a delicious, home-cooked dinner. Especially during warmer months, slow cooking allows you to prepare hearty meals without heating up your kitchen, making it a summertime staple. We’re confident this will quickly become a new family favorite in your recipe repertoire.

Cooking flank steak in the Crockpot is, without a doubt, the best method for achieving unparalleled tenderness. Even thicker cuts of protein, or occasionally frozen roast pieces, transform into fork-tender, delectable bites with very little initial preparation. For our family, smothering this succulent beef in a thick, flavorful gravy isn’t just an option—it’s an absolute must. It evokes cherished memories of childhood meals, reminiscent of how our grandmothers prepared their comforting Sunday dinners.

To elevate the dish further, we highly recommend adding sliced mushrooms and onions. These humble vegetables are a budget-friendly way to introduce fantastic texture and an extra layer of savory depth to almost any meal. Imagine waking up, tossing all your ingredients into the slow cooker, and by the time everyone is home and hungry, a magnificent, fall-apart tender dinner awaits. Don’t expect to slice this steak neatly; it will be far too tender for that. Instead, it will be more akin to the most incredible, melt-in-your-mouth Crockpot pulled beef you’ve ever experienced.

Key Ingredients for Flavorful Slow Cooker Flank Steak

Crafting the perfect slow cooker flank steak starts with selecting quality ingredients and understanding their role in developing a rich, comforting flavor profile. Here’s a breakdown of what you’ll need and why:

For the star of the show, we used a 1.5-2 lb flank steak. This size typically serves 4-6 people, depending on appetites. For our family of five, it provides a generous meal with enough leftovers to enjoy the next day—a fantastic bonus!

Can you use hanger steak instead of flank steak?

Absolutely! Hanger steak is an excellent substitute, and many find it to be even more tender than flank steak. Both cuts perform similarly in a slow cooker, requiring low heat and extended cooking times to break down their fibers and achieve that desirable fall-apart texture. Our mushroom gravy recipe pairs beautifully with either cut, ensuring a delicious result every time. The key for both is patience and low heat, allowing time to work its magic.

You’ll want a tablespoon of olive oil for this recipe. If olive oil isn’t on hand or you prefer an alternative, avocado oil is a fantastic choice due to its mild flavor and beneficial health properties. It helps to coat the meat and meld the seasonings effectively.

For an aromatic boost, we prefer using minced garlic. Its rich, pungent flavor is indispensable in this dish. If you’re short on time, jarred minced garlic works perfectly and saves on prep. However, freshly minced garlic offers an unparalleled depth of flavor.

Of course, you’ll need a flavorful liquid for the slow cooking process. While water can work in a pinch, beef broth is by far our top recommendation. The broth infuses the meat and gravy with an incredible depth of beefy flavor and also contributes a subtle saltiness that enhances the overall dish. While other broths could be used, beef broth is the ideal choice for this particular recipe.

To introduce wonderful texture and create a dish reminiscent of a healthier stroganoff, we add a package of sliced mushrooms. For mushrooms that retain a bit more firmness, opt for baby bellas (also known as cremini or small portabellas). Standard white button mushrooms are also fine but will become quite soft and blend more into the gravy.

Slice one white or yellow onion, or even a combination of varieties, to add essential flavor and texture. Onions are an economical and effective way to build the aromatic foundation of this hearty meal.

For the butter, we highly recommend Kerrigold salted butter for its rich flavor. However, if you have dietary restrictions, a dairy-free or vegan butter alternative can be used without significantly altering the outcome of the dish.

Finally, cornstarch is crucial for thickening the delectable gravy at the end. If you prefer to use the cooking liquid as a thinner au jus rather than a thick gravy, you can omit the cornstarch. However, for that classic, comforting gravy texture, it’s a must-have.

The beauty of this recipe lies in its simplicity. Just layer the seasoned meat and vegetables into your slow cooker, then pour in the liquid. Towards the end of the cooking time, you can whisk the cornstarch directly into the pot to thicken the sauce, or briefly transfer some liquid to a small saucepan for a quick boil and whisk. Once thickened, shred or slice the incredibly tender meat and serve it over creamy garlic mashed potatoes for the ultimate comfort food experience.

This dish truly shines because of its incredible sauce. While you could opt for a pre-packaged slow cooker sauce for convenience, crafting our homemade mushroom gravy from scratch is highly recommended for superior flavor. If you’re in the mood for a different twist, a rich onion gravy is also an excellent and equally delicious alternative.

A thick, robust gravy is absolutely essential for serving alongside this flank steak. It not only adds an explosion of flavor but also keeps the entire dish wonderfully moist and luxurious. Feel free to customize the gravy with a touch of cayenne pepper for a subtle spicy kick, or incorporate other herbs for an even more complex profile. Whether you choose to make it from scratch or opt for a quality ready-made option, the gravy completes this magnificent meal.

Does flank steak get more tender the longer you cook it in a slow cooker?

Yes, that’s precisely the magic of slow cooking. Flank steak, a leaner cut of beef, benefits immensely from prolonged, low-temperature cooking. This extended heat slowly breaks down the connective tissues within the meat, transforming it from a potentially chewy cut into something incredibly tender and succulent. So, if your schedule shifts and you end up cooking it an hour longer than planned, don’t worry—it likely won’t be ruined. In fact, it might even be more tender and delicious than you initially anticipated. Just remember, the goal here is melt-in-your-mouth tenderness, so don’t expect clean, thin slices like you would from a grilled steak. It’s more about that delightful, shreddable texture. Many modern slow cookers come with convenient timers that automatically switch to a ‘keep warm’ function, providing even more flexibility.

This slow-cooked approach is quite different from preparing cuts like T-bone, New York strip, or porterhouse, which are typically cooked quickly to a medium-rare or medium doneness, as seen in recipes like Crockpot steak and potatoes where the aim is a distinct slice and chew.

Should I sear flank steak before putting it in the Crockpot?

You have the option to sear the flank steak before slow cooking, and I’ve prepared it both ways. Searing beef quickly over high heat creates a beautiful browned crust and helps to lock in those delicious juices, adding another layer of flavor through the Maillard reaction. This is often recommended for many slow cooker recipes. However, if you’re pressed for time or simply forget this step, your dish will absolutely not be ruined. The slow cooking process, combined with the onions and our rich gravy mixture, will still yield a perfectly tender, melt-in-your-mouth texture even without the initial sear. Feel free to place the seasoned flank steak directly into the Crockpot with your other ingredients for a truly hands-off experience.

How long does flank steak take to slow cook?

For optimal tenderness, flank steak typically requires about 8-10 hours of cooking on the low setting in a slow cooker. The exact time can vary slightly depending on the thickness of your particular cut of steak and the specific model of your slow cooker. Many modern slow cookers are equipped with a convenient feature that automatically switches from the “cook” setting to a “keep warm” setting once the programmed cooking time is complete. This ensures your dinner is perfectly cooked and ready when you are, without continuing to cook and potentially drying out the meat, but also without becoming cold. It maintains the ideal temperature and tenderness until dinnertime.

How many hours do you cook flank steak in slow cooker on high?

We do not recommend cooking flank steak on the high setting in a slow cooker, ever. The fundamental principle of using a slow cooker is to utilize low heat over an extended period. This method is crucial for breaking down the tough connective tissues in cuts like flank steak, gradually transforming them into incredibly tender, easily shreddable meat. Cooking on high heat would rush this process, likely resulting in a tough, dry, and less flavorful outcome, completely defeating the purpose of slow cooking.

Creative Serving Suggestions for Your Slow Cooker Flank Steak

Once your incredibly tender slow cooker flank steak is ready, the serving possibilities are endless, depending on your cravings. Some enjoy a lighter, vibrant approach, squeezing fresh lime juice over the shredded beef and serving it inside warm tortillas for delicious tacos. This offers a zesty contrast to the rich flavors. Others prefer the traditional, hearty comfort food experience, generously smothering the beef with our rich brown gravy atop a mound of creamy mashed potatoes or alongside perfectly cooked rice. No matter how you choose to enjoy it, this juicy and tender flank steak is destined to become one of your all-time favorite beef recipes.

Ready for Your Next Culinary Adventure?

If you’ve already savored this amazing slow cooker flank steak and are looking for your next delicious project, we highly recommend trying our slow cooker carne asada recipe. This recipe can also utilize flank steak or a skirt steak, both of which are generally more budget-friendly cuts. It’s worth noting that skirt steak tends to be a bit tougher than flank steak and often requires a slightly different cooking time to achieve optimal tenderness, usually a bit less in the slow cooker compared to flank steak to prevent it from becoming overly stringy. Experiment with both cuts to discover your personal preference!

We’ve also extensively cooked Crockpot chuck roast, another fantastic slow cooker option. Chuck roast often works exceptionally well because it’s typically marbled with a good amount of fat, which renders down during the long cooking process, adding immense flavor and moisture to the overall dish. Flank steak, by contrast, is a much leaner cut of beef. For this reason, it’s crucial to ensure it remains moist throughout the entire cooking duration to prevent it from drying out. The generous amount of liquid and the thick gravy in this recipe are key to keeping your flank steak perfectly succulent.