This Slow Cooker Flank Steak recipe is perfect for a busy weeknight dinner or a cozy Sunday meal with the family. Tender and juicy flank steak made in the slow cooker.
The best part? You can set it and forget it while your house fills with mouth-watering aromas.
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Why you'll love this recipe
- Slow Cooker Flank Steak is very easy to prepare .
- Making flank steak in the slow cooker is very versatile: slather with a BBQ Sauce, Teriyaki Sauce, or Steak Seasoning.
- It's budget-friendly
🧾 Ingredient List
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- beef flank steak
- chili powder
- garlic powder
- granulated white sugar
- salt
- black pepper
- olive oil
- red wine vinegar
- Dijon mustard
- yellow onion
Equipment
- Ninja 8-1 Slow Cooker
- Cutting Board
- knife
- Measuring Spoons and Cups
Instructions
This is an overview of the recipe. The full instructions are below in the recipe card.
- Season the flank steak well on both sides. Lightly pat the seasonings into the meat.
- Sear the steak in a hot skillet on both sides for 3 minutes per side.
- Add the onions to the bottom of the slow cooker.
- Place the browned steak to the slow cooker on top of the onions. Pour the red wine vinegar into the skillet, scraping to remove any stuck-on pieces. Mix in the Dijon mustard with the red wine vinegar. Pour the sauce over the steak.
- Place the lid on the slow cooker. and cook on low for 4 hours. The meat will be tender and cooked through. Transfer to the cutting board, and let the steak rest for 10 minutes.
- Slice the steak against the grain, and then return the steak to the slow cooker or serve on a platter with the onions and juices.
Eileen's Tips for Success
- One of my favorite garnishes for this tender meat is a sprinkle of sliced green onions and a squeeze of fresh lime juice for a delicious flavor.
- Leftovers make delicious tacos with Pico de Gallo, Tomatillo Salsa, and guacamole.
- If you want to make a gravy to top mashed potatoes, rice, or noodles, add a cornstarch slurry to the slow cooker juices and cook until the sauce thickens.
Variations
Do you want to change up this recipe? Here are some ways that you increase the flavor of this dish.
- Spice: Add a can of diced tomatoes with green chilies for spice.
- Herbs: Add any fresh herbs in season.
- Garlic: Add fresh chopped garlic to the slow cooker vessel.
- Umami: A dash of soy sauce or Worcestershire sauce can add a rich flavor to the juices.
- Gravy: To make gravy, mix cornstarch with cold water and add to the slow cooker to thicken the sauce.
Make-ahead, storage, and freezer tips
Make ahead - One great thing about this recipe is that it makes for great leftovers. So, feel free to reheat it ahead and just reheat it when you are ready to enjoy it.
Storage - Store leftover flank steak in an airtight container in the fridge for 3-4 days.
Freezing - This dish can also be frozen for longer storage. Let it cool completely before transferring it to a freezer-safe container.
Frequently Asked Questions
The best way to reheat flank steak made in the slow cooker is to place it in a skillet or on a baking sheet and heat it in the oven at 350 degrees Fahrenheit for about 10-15 minutes, or until heated through. You could also reheat it in the microwave by eating it for 1-2 minutes.
Yes, you can use other cuts of beef, such as sirloin steak, London broil, or skirt steak. Adjust the cooking time accordingly, as these cuts may cook faster than flank steak.
Yes, however, for this recipe, I recommend searing the steak first because it will give you the best flavor.
I love any comments or questions, please feel free to leave them below.
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Eileen xo
If you click on the number of servings in the recipe card, you can adjust the measurements up or down for the exact number of servings you need.
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Slow Cooker Flank Steak
As an Amazon Associate, I earn from qualifying purchases
Equipment Needed:
Ingredients
- 2 pound flank steak Note 1
- 1 teaspoon chili powder
- 1 teaspoon garlic powder
- ½ teaspoon granulated sugar
- ½ teaspoon salt
- ½ teaspoon black pepper
- 1 Tablespoon olive oil
- 1 cup yellow onion (peeled and sliced thin) Note 2
- 2 Tablespoons red wine vinegar
- ½ teaspoon Dijon mustard
Instructions
- Season the 2 pound flank steak with 1 teaspoon chili powder, 1 teaspoon garlic powder, ½ teaspoon granulated sugar, ½ teaspoon salt, and ½ teaspoon black pepper
- Heat a heavy skillet or cast-iron pan over medium-high heat. Add 1 Tablespoon olive oil and swirl around the skillet. Add the seasoned flank steak to the skillet and cook until browned, about 3 minutes per side.
- While the steak is browning, spread 1 cup yellow onion (peeled and sliced thin) in the bottom of the slow cooker.
- When the steak is browned on both sides, transfer the steak to the slow cooker and place it on top of the sliced onions.
- Pour 2 Tablespoons red wine vinegar into the skillet, scraping to pull up any brown bits. Whisk in ½ teaspoon Dijon mustardinto the skillet to blend with red wine vinegar. Pour the sauce over the steak.
- Place the lid on the slow cooker. Cook on low for 4 hours. The meat will be tender and cooked through.
- Transfer the steak to a cutting board. Let the steak rest for 10 minutes. Thinly slice the steak, against the grain. Serve with the onions and juices from the pan.
- Serve with your favorite sides like mashed potatoes, green beans, or potato salad.
NOTES
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