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Crockpot Smothered Flat Iron Steak

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A Crockpot Smothered Flat Iron Steak with only five ingredients and four hours of cook time.

Enjoy a tender and delicious meal of melt-in-your-mouth flat iron steak slow-cooked to perfection. If you love this, you will also enjoy this recipe for Crockpot Flat Iron Steak and Mushroom Gravy.

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Slow Cook Flat Iron steak comes out really tender and delicious. Plus it is easy to cook for a weeknight meal or Sunday dinner.

This recipe cooks for 2 to 4 hours in the crockpot depending on if you cook on high or low. Either way, I have found that slow cooking this cut of beef makes it come out nice and tender.

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Crockpot Smothered Flat Iron Steak Recipe

A few simple ingredients will make a nice tender steak with rich gravy. Serve on homemade mashed potatoes for a weeknight dinner.


  • 1 Flat Iron Steak, for 2
  • Bottle of Balsamic Dressing, I used this one (Amazon)
  • 1 Large Vidalia Onion, chopped
  • 1  pkg. fresh portabella mushrooms chopped
  • Salt and Pepper to taste

Step 1

Rinse the flat iron steak and place into your Crock Pot

HINT: I like to line my Crock Pot with these fabulous liners for easy clean-up.

Step 2

Sprinkle the meat with salt and pepper to taste and then pour the bottle of Balsamic over top of the meat

Step 3

Top the meat with the chopped onions and mushrooms

Step 4

Cook on high for about 2 hours or low for about 4 hours. Test the meat with an instant read thermometer like this one to determine if it is done.

Serve and enjoy!


flat iron steak and gravy

Crockpot Smothered Flat Iron Steak

Another easy 5 ingredient dinner ready in up to 4 hours from the Crockpot.
Prep Time 5 mins
Cook Time 4 hrs
Total Time 4 hrs 5 mins
Servings 2 people


  • 2 lb. Flat Iron Steak
  • 1 12 oz. Balsamic Dressing
  • 1 Large Onion cut up
  • 1 pkg. Mushrooms, cut up
  • 1 tsp. salt or pepper to taste


  • Wash your flat iron steak and place it into the crockpot.
  • Add salt and pepper or desired seasoning.
  • Pour the bottle of dressing over the top of meat.
  • Top with cut up onions and mushrooms,
  • Cook on high for 2 hours or low for about 4 hours. The steak should be well done at 160ΒΊ after these cooking times. Serve and enjoy!
Tried this recipe?Let us know how it was!

This Slow Cooker Flat Iron Steak recipe is an easy recipe for a weeknight meal. You’ll enjoy the tender and delicious meat.

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Easy Crockpot Beef Tips & Gravy With Two Ingredients

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    1. I know, Kristen. I’m apparently behind in the flat iron steak world too. When I was researching how to cook it, I was surprised at how many people already knew. It was my daughter who told me about it.

  1. Looks delish! I want to try this out. I love all your recipes; you seem to be a great cook! I can tell from the looks of the recipes you share and from the pecan glazed green beans that I have tried!

    1. Zan, I’m so glad you enjoyed the pecan glazed green beans πŸ™‚ I don’t cook every day but I have been cooking for over 36 years now. I love reading recipes and learning new good things to cook! I have a nice cookbook collection and enjoy reading through them also! Thanks for the compliment πŸ™‚

  2. I’m always looking for new slow cooker recipes to cook for the family while at church on Sunday. We’ve grown too much to eat out after church! This one certainly fits the bill and my family will love it! Pinning!

  3. Steak and onions, nothing better. This sounds great! I am always looking for new crock pot recipes. This is getting pinned for the next time flat iron steak goes on sale. And if it doesn’t soon I may try it on a round steak. YUM!

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