Broiled Flat Iron Steak with Herb Roasted Mushrooms

This past summer I shared a recipe for Grilled Flat Iron Steak with Tomato Salad. I think that it is the perfect way to enjoy steak during the summer, but now that we are well into fall, I wanted to share a recipe that would fit perfectly at your fall dinner table. Enter this Broiled Flat Iron Steak with Herb Roasted Mushrooms.

With the holidays coming, so are the dinner parties. So now is a good time to start getting those menu planning gears in motion. This steak NEEDS to be on your list. It’s a dish that will make your guests “oh” “ah” and “mmm” all at once. It sounds all kinds of fancy but it is beyond easy to make. You’ll even have time to spend hanging out with your guests. Crazy thought right?!

At 20 minute roasting time, preparing the mushrooms is what takes the longest in this recipe, but it’s totally worth it. Roasting them gives them this sweet earthy flavor. Throw in the fresh herbs and roasted garlic and you’ve got my new favorite topping for steaks.

Speaking of steaks, this one doesn’t get much in the way of seasoning, because it doesn’t need it. Just a little salt and pepper and you’re good to go. But because this is a flat iron steak, be sure not to cook it much more then medium. I say medium rare is the best, otherwise you’ll find that it’s too tough.

And no one likes a tough steak, trust me.

Also trust me when I say that you and your guests will LOVE this steak. It’s too perfectly simple and delicious not to.


Broiled Flat Iron Steak with Herb Roasted Mushrooms Recipe

Serves 4 Prep Time: Cook Time:


  • 4 cups quartered crimini mushrooms
  • 8 cloves garlic, peeled
  • 1 tablespoon chopped fresh rosemary or 1 teaspoon dried
  • 1 tablespoon chopped fresh summer savory or 1 teaspoon dried
  • 2 tablespoons olive oil
  • 1 3/4 - 2 pound flat iron steak
  • salt and pepper



Preheat oven to 425 degrees.


Toss crimini mushrooms, garlic, rosemary and summer savory in olive oil. Place on a baking sheet and bake in preheated oven for 20 minutes, stirring once, until mushrooms are browned. Remove from oven, season to taste with salt and pepper. Cover to keep warm.


Heat broiler. Line a baking sheet with aluminum foil and place a cooling rack on top.


Liberally season both sides of the steak with salt and pepper. Place steak on cooling rack and broil 5 - 7 minutes per-side for medium rare.


Remove from oven, loosely cover with foil and allow to rest for 10 minutes.


Slice steak against the grain, spoon mushrooms over the top and serve.



Leave a Comment

  • Reply
    Kim Beaulieu of Cravings of a
    October 28, 2014 at 11:02 pm

    Okay, seriously, you have no idea how much a steak lover I am. I want to hop on a plane and head to your house immediately. This is stellar.

  • Reply
    Taking On Magazines
    October 28, 2014 at 6:34 pm

    That is totally my kind of steak! I love the mushrooms on top, adore flat iron as a cut of meat, and like my steak rare so I know it wouldn’t be tough.

    • Reply
      October 29, 2014 at 9:51 pm

      It is one of my favorite cuts of meat!

  • Reply
    Erin @ Dinners, Dishes...
    October 28, 2014 at 5:41 pm

    I just had flat iron steak for the first time this weekend. So good!! Love this quick recipe for a party.

  • Reply
    Lemons for Lulu
    October 28, 2014 at 5:08 pm

    Twenty minutes to a tasty steak sounds good to me!

  • Reply
    October 20, 2014 at 5:35 pm

    I love this idea for a dinner party recipe!

  • Reply
    taylor @ greens & chocolate
    October 20, 2014 at 4:18 am

    I NEED this on our menu!! Love everything about it!

  • Reply
    October 20, 2014 at 4:08 am

    My husband would LOVE this! Actually my whole family would. I don’t cook steak often and when I do it’s usually on the grill. Would love to try this next time instead! It looks delicious!!

  • A little bit about me...

    Hi! I am Des! Welcome to Life’s Ambrosia where Dinner is served and memories are made. Here you will find over 1000 tried and true recipes for every possible occasion. In the last 10 years, this blog has helped millions of families put dinner on the table and create food memories. Let me help you too. Read more »

    Have new recipes emailed to you.