• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
Munchkin Time
  • Recipe Index
  • About
  • Contact
menu icon
go to homepage
  • Recipe Index
  • About
  • Contact
    • Facebook
    • Instagram
    • Pinterest
    • YouTube
  • search icon
    Homepage link
    • Recipe Index
    • About
    • Contact
    • Facebook
    • Instagram
    • Pinterest
    • YouTube
  • ×
    Home » Recipes » Grilling

    Caramelized Onions Burger with Shiitake Mushrooms

    Jul 23, 2022 by Love Keil · This post may contain affiliate links · 2 Comments

    124 shares
    Jump to Recipe Jump to Video Print Recipe

    Caramelized Onions Burger with Shiitake Mushrooms - the best burger recipe you’ll try this grilling season! It’s a step above your average burger but it’s still super easy to make and worth every extra step because it is just that good!

    Shiitake Mushrooms & Caramelized Onions Burger

    It’s a juicy beef burger topped with caramelized onions and shiitake mushrooms along with traditional toppings like American cheese slices, lettuce tomatoes, all sandwiched between a buttery crispy brioche bun smothered in mayo and sriracha. The best part? The burger is stuffed with nacho cheese dip!

    Give your burgers, whether homemade or store bought the facelift it deserves and level up your grilled recipes for cookouts, BBQs, or family gatherings! There is nothing better than biting into a nice juicy burger but when you add caramelized onion and mushroom for burger toppings and all of those delicious flavors, let’s just say I could easily eat more than one!

    Ingredients Needed for Caramelized Onions Burger

    ingredients for burger

    For the Caramelized Onions and Mushrooms

    • Butter: Stick with unsalted so that way you can control the amount of added salt. The butter is the fat needed to help cook down the onions and mushrooms, bringing out their deep flavors.
    • Onions: Once cooked down, you’ll notice they shrink! Use 2 onions of any variety. White onions, Vidalia, shallots, red onions, you name it.
    • Shiitake mushrooms: I prefer shiitake just because I usually keep those on hand. All mushrooms are healthy, however shiitake has a leg up on the others. You use whatever kind of mushrooms you like, they all work!
    • Sea salt: Brings out the flavors even more.
    • Sugar: Helps to break down the mushrooms and onions and adds a sweetness that complements the caramelization.

    For the Burgers

    • Brioche buns: Buttery and soft buns are the perfect pairing to your beef patties. You can also go for regular burger buns instead. I have a really great quick burger bun recipe to try.
    • Beef patties: Store Bought or homemade. It’s up to you!
    • Montreal steak spice: Adding a bit of this to the patties while they grill gives it extra flavor.
    • Toppings: American cheese, tomato slices, red onions, and lettuce.
    • Nacho cheese dip: I always aim to use a homemade nacho cheese dip if I have some extra time, but a shortcut works just as well. It’ll be injected into the meat through a syringe, so make sure it’s warm and thinned out.
    • Burger sauce: Mayo & Sriracha or your favorite burger sauce.

    When YOU make Caramelized Onions Burger Recipe PLEASE hashtag #munchkintimeblog on Instagram, we would LOVE to see your creation! Thank you!

    How to Make a Burger with Caramelized Onions

    How to Make a Burger with Caramelized Onions

    Step 1: Melt butter in a skillet over medium heat and add the onions to sauté for about 10 minutes, stirring occasionally, until it starts turning a golden color.

    Caramelized Onions with mushrooms

    Step 2: Add the rest of the butter along with the mushrooms, sugar, and salt and continue to sauté for another 5 minutes until the mushrooms have cooked through. Remove from the heat and set those aside.

    toasted buns

    Step 3: Open the buns and lay both halves face side down onto a greased grill or skillet to toast until crispy. Remove them and set them aside, open faced.

    seasoned beef patties
    Step 4: Grease the grill once more and cook the burger patties, flipping halfway, until cooked through and desired doneness has been reached. While they’re on the grill, sprinkle with Montreal steak spice on both sides.

    cheesy patties
    Step 5:
    Place a slice of American cheese on each one of the patties to melt.

    How to Assemble this Onion & Shiitake Mushroom Burger

    How to Assemble this Onion & Shiitake Mushroom Burger

    There are no hard and fast rules about how to top your burger. Use my instructions as a guide and take it from there! Here’s how I like to assemble mine:

    1. Spread mayo and sriracha sauce over both halves of the bun.
    2. Place 2 patties (optional, you can definitely stick to 1 if you’d like) with melted cheese onto the bottom bun.
    3. Top with sliced red onions, a slice of tomato, leaf of lettuce, and of course the caramelized onions and mushrooms. Close it up with the top bun.
    4. Fill a stainless steel syringe filled with nacho cheese and pierce it right into the burger. If you want to get fancy, especially when serving a crowd, serve the burger with the cheese syringe in it! Squeeze the nacho cheese into the burger and enjoy!

    Tips & Variations

    Shiitake Mushrooms & Caramelized Onions Burger
    • The internal temperature of a done burger should be 160 degrees F. For the most accurate reading, use a thermometer. Otherwise, just make sure it’s no longer pink in the middle.
    • Be careful not to overcook the burger because it will dry out!
    • If you don’t have a syringe, don't worry. You can use the nacho cheese as a topping instead, or omit it altogether.
    • Make more caramelized onions than you need and keep the leftovers. They can be used in so many other ways. Top your hot dogs, pizza, salads, and sandwiches!
    • Always cook the onions first. Do not add the mushrooms in at the same time. Mushrooms give off water, which will slow down the caramelization process for the onions. They also cook much faster than onions do, so they will be overdone by the time the onions are finished cooking.

    What to Serve With This Tasty Burger!

    As you can see there’s a lot going on with this burger, so it won’t need much on the side.

    I usually go the traditional route with a side of air fryer french fries or a cabbage salad. You can also use some of the extra caramelized onions to make cheesy mashed potatoes with caramelized onions and serve them on the side.

    If you’re already grilling up a storm, you could always make some grilled veggies or corn on the cob. A refreshing avocado corn salsa would also be great.

     

    📖 Recipe

    Shiitake Mushrooms & Caramelized Onions Burger

    Shiitake Mushrooms & Caramelized Onions Burger

    Love Keil
    Caramelized Onions Burger with Shiitake Mushrooms – the best burger recipe you’ll try this grilling season!
    5 from 1 vote
    Print Recipe Pin Recipe
    Prep Time 10 minutes mins
    Cook Time 20 minutes mins
    Course Main Coarse
    Cuisine American
    Servings 4 burgers
    Calories 1077 kcal

    Equipment

    • Cheese Syringe

    Ingredients
      

    Ingredients for Caramelized Onions & Mushrooms

    • 4 tablespoons butter divided
    • 2 onions diced
    • 12 oz shiitake mushrooms diced
    • ½ teaspoon sea salt
    • 1 teaspoon sugar

    Ingredients for the Burger

    • 4 brioche buns or regular burger buns
    • 8 beef patties
    • Montreal steak spice
    • 4 American cheese wrapper removed
    • 1 large tomato sliced
    • 4 lettuce leaves
    • 8 oz nacho cheese dip
    • 1 medium red onion sliced
    • mayo
    • sriracha sauce or any of your favorite burger sauces

    Instructions
     

    How to Caramelized Onions with Mushrooms

    • Into the skillet add 2 tablespoons of butter, once butter melts add onion and saute on medium heat for about 10 minutes, stirring few times, or until golden color.
      How to Make a Burger with Caramelized Onions
    • Next add the rest of the butter (2 tablespoons), shiitake mushrooms, ½ teaspoon of salt and 1 teaspoon of sugar. Mix and saute for 5 minutes, or until mushrooms are cooked thru, mixing few times. Remove from the heat and set aside.
      Caramelized Onions with mushrooms

    How to Make Burgers

    • Using a greased grill or a greased skillet, toast buns until crispy. Remove the buns and set them aside, open faced.
      toasted buns
    • After, grease the grill or skillet with a little bit of oil or melted butter, add patties and cook on both sides until desired burger done temperature is reached. While grilling/cooking, season patties with Montreal steak spice to taste, on both sides.
      seasoned beef patties
    • Next, add sliced American cheese on top of the hot patties.
      cheesy patties

    How to Assemble a Burger

    • 1. To assemble a burger, squeeze mayo and sriracha sauce over both toasted buns, spread with butter knife.
      2. Place 2 patties with melted cheese on the bottom bun, followed by sliced red onion, tomato slice, green lettuce leaf, caramelized onion with mushrooms and top it off with the top bun.
      3. Pierce the burger with a syringe filled with nacho cheese. Press the nacho cheese into the burger and enjoy!
      Shiitake Mushrooms & Caramelized Onions Burger

    Video

    Notes

    Hi! All content & images are copyright protected. Please do not use my images without prior permission. If you want to republish this recipe, please re-write the recipe in your own words, or simply link back to this post for the recipe. Thank you.

    Nutrition

    Calories: 1077kcalCarbohydrates: 56gProtein: 50gFat: 73gSaturated Fat: 36gPolyunsaturated Fat: 2gMonounsaturated Fat: 20gTrans Fat: 1gCholesterol: 315mgSodium: 1303mgPotassium: 1172mgFiber: 4gSugar: 8gVitamin A: 3426IUVitamin C: 17mgCalcium: 321mgIron: 6mg
    Tried this recipe?Let us know how it was!

    Q. Do YOU like this Burger Recipe?

    Please let me know in the comments below we would love to hear from you!

    Thank YOU for YOUR Comment, Share & Recipe Review!

    Happy Cooking! 

    More Grilling

    • Perfectly Grilled Lemon Garlic Chicken Thighs Skewers on a blue plate.
      Grilled Lemon Garlic Chicken Thighs Skewers
    • closer shot of grilled Beef Kebabs on a platter.
      Juicy Grilled Beef Kebabs (Easy Steak Kabob Marinade)
    • carne asada steak sliced on a cutting board and ready to be served.
      Best Carne Asada Marinade
    • Grilled Ribeye with garlic butter on top.
      How to Grill Ribeye Steak with Garlic Butter

    Reader Interactions

    Comments

      5 from 1 vote

      Leave a Reply Cancel reply

      Your email address will not be published. Required fields are marked *

      Recipe Rating




    1. Cheryl

      February 21, 2024 at 11:12 am

      5 stars
      Thank you for introducing me to Sriracha mayo!

      Reply
      • Munchkin Time

        February 23, 2024 at 4:16 am

        You are very welcome, Cheryl!

        Reply

    Primary Sidebar

    Love Keil from munchkintime.com

    Love Keil is a food photographer, blogger and a recipe developer. She is passionate about creating delicious homemade meals for her family.

    More about me →

    Popular Recipes

    • Chicken Recipes
      Honey Soy Chicken Thighs Recipe (Video)
    • Easy Chicken Madeira Recipe with Secret Sauce
      Easy Chicken Madeira Recipe with Secret Sauce
    • Easy Chicken Alfredo Recipe
      Easy Chicken Alfredo Recipe with Pasta
    • 2 Smoked Salmon Avocado Toasts with Cherry Tomatoes
      Smoked Salmon Avocado Toast with Cherry Tomatoes
    • Easy Shepherd's Pie
      Easy Shepherd's Pie
    • Cooked chicken thighs
      Best Hawaiian BBQ Chicken Recipe (VIDEO)

    Favorites

    • Easy Ground Beef Casserole
      Easy Ground Beef Casserole (Video)
    • Best Swedish Meatballs and Gravy
      Best Swedish Meatballs and Gravy
    • smash chicken burger
      Smash Chicken Burger (Video)
    • Perfectly Grilled Lemon Garlic Chicken Thighs Skewers on a blue plate.
      Grilled Lemon Garlic Chicken Thighs Skewers
    • best way to cook ribeye steak
      How to Cook Ribeye Steak in the Oven (Video)
    • Creamy Tomato Bisque Soup with bacon grilled cheese sandwich. 
      Creamy Tomato Bisque Soup Recipe 
    • salad and dressing
      Cucumber Tomato Salad
    • carne asada steak sliced on a cutting board and ready to be served.
      Best Carne Asada Marinade
    • Best Oven Baked Chicken Thighs
      Best Oven Baked Chicken Thighs
    • Bacon Egg and Cheese Breakfast Burrito
      Bacon Egg and Cheese Breakfast Burrito

    Footer

    Privacy Policy About Contact

    Copyright © 2024 MunchkinTime

    Rate This Recipe

    Your vote:




    Let us know what you thought of this recipe:

    This worked exactly as written, thanks!
    My family love this recipe!
    Thank you for sharing this recipe!
    Quick question...

    Or write in your own words:

    A rating is required
    A name is required
    An email is required

    Recipe Ratings without Comment

    Something went wrong. Please try again.