Simple Crockpot Flank Steak: The Easiest & Most Delicious Slow Cooker Recipe

If you’re looking for a foolproof, tender, and flavorful meal that practically cooks itself, this Simple Crockpot Flank Steak is the answer! Perfect for busy weeknights, meal prep, or even a cozy weekend dinner, this slow cooker flank steak is packed with rich, savory flavors and falls apart with every bite.

In this ultimate guide, we’ll walk you through everything you need to know about making the best Simple Crockpot Flank Steak, including:

• Why flank steak is perfect for slow cooking

• Step-by-step instructions for the most tender results

• Expert tips to enhance flavor and texture

• Serving suggestions and side dish ideas

• Nutritional benefits of this protein-packed meal

• FAQs to troubleshoot common questions

By the end of this post, you’ll be a flank steak slow-cooking expert—ready to impress your family with minimal effort!

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Why Flank Steak in a Crockpot?

Flank steak is a lean, flavorful cut from the cow’s abdominal muscles. While it can be tough if cooked improperly, the slow cooker transforms it into melt-in-your-mouth perfection. Here’s why this method works so well:

✅ Breaks Down Tough Fibers – Slow cooking tenderizes the meat naturally.
✅ Locks in Juices – Unlike grilling or pan-searing, the crockpot keeps moisture intact.
✅ Hands-Off Cooking – Set it and forget it—perfect for busy schedules!
✅ Versatile & Flavorful – Pairs well with spices, sauces, and veggies.

Now, let’s dive into the best Simple Crockpot Flank Steak recipe you’ll ever make!

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Simple Crockpot Flank Steak Recipe

Ingredients You’ll Need

Here’s everything required for the most tender slow cooker flank steak:

• 1 (2-pound) flank steak (trimmed if needed)

• 1 tsp garlic powder

• 1 tsp onion powder

• 1 tsp Italian seasoning blend

• ½ tsp salt (adjust to taste)

• ½ tsp black pepper

• 2 tbsp extra virgin olive oil (for searing)

• 1 cup thinly sliced onions

• 3 cloves garlic (minced)

• 1 packet au jus mix (or substitute with beef gravy mix)

• 1 cup beef broth (low-sodium if preferred)

• ¼ cup unsalted butter (for richness)

• Fresh parsley (optional, for garnish)

Step-by-Step Instructions

1. Prep the Slow Cooker

• Lightly spray your 8-quart slow cooker with cooking spray to prevent sticking.

2. Season the Flank Steak

• Pat the steak dry with paper towels.

• Rub both sides with garlic powder, onion powder, Italian seasoning, salt, and pepper.

3. Sear for Maximum Flavor

• Heat olive oil in a large skillet over high heat.

• Sear the steak for 2-3 minutes per side until a golden-brown crust forms.

• Transfer to the slow cooker.

4. Soften Onions & Garlic

• In a microwave-safe bowl, combine onions and garlic.

• Microwave for 2-3 minutes until slightly softened (this enhances flavor).

• Spread around the steak in the slow cooker.

5. Make the Au Jus Mixture

• In a small bowl, whisk au jus mix and beef broth until smooth.

• Pour evenly over the steak.

• Place butter on top for extra richness.

6. Slow Cook to Perfection

• Cover and cook on:

  • Low for 6-8 hours (best for ultra-tender shredding)

  • High for 3-4 hours (if short on time)

7. Shred or Slice Against the Grain

• Remove steak and let rest for 5 minutes.

• Shred with forks (for tacos, sandwiches) or slice thinly against the grain (for steak dinners).

• Garnish with fresh parsley if desired.

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Why Flank Steak is Perfect for Slow Cooking

Flank steak is one of the most underrated cuts of beef, but when cooked correctly—especially in a slow cooker—it transforms into an incredibly tender, flavorful dish. Many people avoid flank steak because it can be tough if grilled or pan-seared incorrectly, but the slow cooker is the secret weapon that turns this lean cut into a melt-in-your-mouth masterpiece.

What Makes Flank Steak Unique?

Flank steak comes from the cow’s lower abdominal muscles, which means it’s a well-exercised, lean cut with strong muscle fibers. Unlike fattier cuts like ribeye or chuck, flank steak has less marbling, which can make it chewy if not prepared properly. However, this also means it absorbs marinades and seasonings exceptionally well, making it a flavor powerhouse when slow-cooked.

Why the Slow Cooker Works Best

1. Breaks Down Tough Connective Tissue – The low, slow heat gently dissolves collagen, turning it into gelatin, which makes the meat fork-tender.

2. Retains Moisture – Unlike high-heat methods (grilling, broiling), the slow cooker locks in juices, preventing dryness.

3. Hands-Off Cooking – Just sear, set, and forget—perfect for busy days!

4. Better Flavor Infusion – Long cooking allows spices, herbs, and sauces to penetrate deeply.

Best Ways to Use Slow-Cooked Flank Steak

• Shredded for Tacos & Sandwiches – The meat pulls apart effortlessly.

• Sliced for Steak Dinners – Cut against the grain for maximum tenderness.

• Meal Prep Protein – Stays juicy for days, perfect for salads & grain bowls.

Pro Tip: For even more flavor, marinate the steak overnight before cooking!

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 Step-by-Step Guide to Perfect Slow Cooker Flank Steak

Making Simple Crockpot Flank Steak is incredibly easy, but a few key steps ensure the best results. Follow this foolproof method for perfectly tender steak every time.

Step 1: Season Generously

• Pat the steak dry (helps with searing).

• Rub with garlic powder, onion powder, Italian seasoning, salt, and pepper.

Step 2: Sear for Maximum Flavor

• Heat olive oil in a skillet on high.

• Sear 2-3 minutes per side until deeply browned (this adds rich flavor).

Step 3: Layer Ingredients in Slow Cooker

1. Place steak in the crockpot.

2. Add softened onions & garlic (microwaving first enhances sweetness).

3. Whisk au jus mix + beef broth, then pour over steak.

4. Top with butter (for extra richness).

Step 4: Cook Low & Slow

• Low (6-8 hours): Best for shredding.

• High (3-4 hours): Faster, but slightly firmer texture.

Step 5: Rest & Serve

• Let steak rest 5 minutes before slicing against the grain.

• Garnish with fresh parsley and drizzle with juices.

Common Mistakes to Avoid:

• Skipping the sear (loses depth of flavor).

• Overcooking (can make it dry).

• Slicing with the grain (makes it chewy).

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 Serving Ideas & Leftover Makeovers

One of the best things about Simple Crockpot Flank Steak is its versatility. Here’s how to serve it fresh and repurpose leftovers creatively.

Best Side Dishes

• Creamy Mashed Potatoes – Soak up the savory au jus.

• Roasted Vegetables – Carrots, Brussels sprouts, or asparagus.

• Buttered Noodles or Rice – Simple and satisfying.

• Crusty Bread – Perfect for mopping up juices.

Leftover Makeovers

1. Flank Steak Tacos – Warm tortillas, add meat, and top with salsa & avocado.

2. Philly Cheesesteak Sandwiches – Sauté with peppers, onions, and provolone.

3. Steak & Egg Breakfast Hash – Crisp potatoes, fried eggs, and shredded steak.

4. Asian Noodle Stir-Fry – Toss with veggies, soy sauce, and sesame oil.

Storage Tips:

• Fridge: Up to 3 days in an airtight container.

• Freezer: Wrap tightly for up to 3 months (thaw overnight in fridge).

Pro Tip: Freeze portions with juices to keep meat moist when reheating!

Pro Tips for the Best Simple Crockpot Flank Steak

🔹 Don’t Skip the Sear – Searing locks in juices and adds depth of flavor.
🔹 Slice Against the Grain – This shortens muscle fibers, preventing chewiness.
🔹 Adjust Salt Levels – If using au jus mix, you may not need extra salt.
🔹 Add Veggies – Toss in carrots, potatoes, or mushrooms halfway through cooking.
🔹 Use Leftovers Wisely – Perfect for tacos, salads, or steak sandwiches!

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Serving Suggestions

This Simple Crockpot Flank Steak pairs beautifully with:

🍽 Mashed Potatoes – Soak up that delicious au jus!
🍽 Roasted Vegetables – Broccoli, carrots, or green beans.
🍽 Garlic Butter Rice – A simple, flavorful side.
🍽 Crusty Bread – For dipping in the savory juices.

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Nutritional Benefits

This dish isn’t just delicious—it’s also nutrient-packed:

• High in Protein (34g per serving) – Great for muscle repair.

• Rich in Iron & B Vitamins – Supports energy levels.

• Low-Carb Friendly – Only 4g net carbs per serving.

Nutrition Facts (Per Serving):

• Calories: 339

• Fat: 20g

• Carbs: 4g

• Protein: 34g

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FAQs About Simple Crockpot Flank Steak

1. Can I use a different cut of beef?

Yes! Skirt steak or chuck roast also work well, but adjust cooking times (chuck roast may need longer).

2. Can I make this without au jus mix?

Absolutely! Substitute with:

• 1 tbsp Worcestershire sauce + 1 tsp soy sauce

• Beef bouillon + cornstarch slurry

3. How do I store leftovers?

• Fridge: Up to 3 days in an airtight container.

• Freezer: Up to 3 months (thaw overnight before reheating).

4. Why is my flank steak tough?

• Not cooked long enough – Flank steak needs low & slow heat.

• Sliced incorrectly – Always cut against the grain.

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Final Thoughts

This Simple Crockpot Flank Steak is a game-changer for effortless, delicious meals. With minimal prep and maximal flavor, it’s a must-try for any home cook. Whether you’re meal prepping, feeding a crowd, or just craving tender, juicy steak, this recipe delivers every time.