Caramelized Onion & Mushroom Burger with Grain Free Bun

5 from 3 votes

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Friendsss! So many things are happening right now!! Labor day is just around the corner and football season is kicking off too!  Now I am not the biggest football fan but I do love a good football game on TV for the pure fact that there is always delicious food around.  Football games are also the reason that grilling bleeds all the way into fall from summer! I LOVE burgers and they are just the best tailgate food too. And yes you can totally call your house party a tailgate – FYI.  You know I preach balance and not being too strict with clean eating, but if football is every week (and if your really love it, multiple times a week) it can be easy to slip off track with finding clean options!  To make things easier on all of us, I’ve teamed up with my FAVORITE grain free snack and boxed mix brand – Simple Mills to bring you an epic grain free burger bun that you are going to flip over.  Using their Artisan Bread Mix made with only 6 super clean ingredients makes it so simple to make the perfect grain free burger bun.  I also added some dried minced onion to the top of mine because I’m a sucker for an onion bun – but you can top it with sesame seeds, everything bagel seasoning… or leave it plain! You do you, boo.  

So obviously the bun is an important part of any burger, but next up is the toppings!  Let’s be like Simple Mills and pack tons of flavor with minimal ingredients shall we?  I’m talking onions, mushrooms and coconut aminos.  Caramelizing down the onions and mushrooms then splashing them with just a touch of the salty &  sweet coconut aminos makes for an umami powerhouse that completes this perfect burger!  Oh and obvi added mayo and avocado because… BURGERS.  Now it’s your turn to make this simple burger on this holiday weekend!  Check out where you can get this Simple Mills mix near you and get cookin!!

This Caramelized Onion and Mushroom Burger with Grain Free Bun is perfect for labor day and footballs season! A completely paleo burger for everyone to enjoy!

This post is sponsored by Simple Mills! I was compensated and all opinions are 100% my own. Thank you so much for supporting Little Bits Of!

Gotta have the bite shot right??

Need some sides with these burgers:

Chicken Bacon Ranch Potato Salad

Sweet Potato Tater Tots with Honey Mustard Dipping Sauce

Honey Strawberry Lemonade

Orange Chocolate Chip Cookies

This Caramelized Onion and Mushroom Burger with Grain Free Bun is perfect for labor day and footballs season! A completely paleo burger for everyone to enjoy!

Pin this Caramelized Onion & Mushroom Burger with Grain Free Bun to save the recipe for later!

This Caramelized Onion and Mushroom Burger with Grain Free Bun is perfect for labor day and footballs season! A completely paleo burger for everyone to enjoy!

5 from 3 votes

Caramelized Onion & Mushroom Burger with Grain Free Bun

By: Kelsey



  • 1 box Simple MIlls Artisan Bread Mix
  • 1 tablespoon olive or avocado oil
  • ¼ cup unsweetened applesauce
  • 2 eggs
  • 1 tablespoon dried minced onion
  • 1 additional egg for egg wash


  • 1 pound grass fed ground beef
  • 1 tablespoon olive or avocado oil
  • 1 yellow onion, sliced thinly
  • 2 cups sliced mushrooms
  • 1 teaspoon coconut aminos
  • Salt and pepper
  • Avocado
  • Mayonnaise


  • Preheat oven to 350 degrees and line a baking sheet with parchment paper.
  • In a medium sized bowl combine Simple Mills Artisan Bread Mix, oil, applesauce and eggs and stir until combined.
  • Separate dough into 4 or 5 pieces (depending on how big you want your buns)
  • Dab a little bit of water in your hands and roll each dough ball in your hands then place it on the baking sheet and press down just a little.
  • Crack the extra egg in a small bowl and stir to combine.  Take a pastry brush or BBQ brush and brush a little egg wash onto the the dough balls. This will help it get nice and golden brown.  Then sprinkle each with a little dried minced onion.
  • Bake buns for 25 minutes.
  • While the buns bake start on the toppings.  Place a large skillet over medium heat and add 1 tablespoon of oil to the pan. Then add sliced onions and cook, stirring occasionally for 5 minutes.  Once they start to soften add sliced mushrooms, stir, and place a lid on top for 10 minutes, stirring occasionally.
  • Once they are nice and caramelized add in coconut aminos and season with salt and pepper.
  • To make burgers, divide the pound of meat into 4 even pieces and form them into patties.  Sprinkle each side with salt and pepper and cook on a hot grill or stovetop for about 3-5 minutes per side depending on how you like your burger cooked.
  • To assemble the burger, slice your bun in half and on the bottom put some mayonnaise, the patty, avocado, onion mix and top with the other half of the bun.
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Recipe Rating


    1. 5 stars
      The applesauce added a nice sweetness to the finished bun and adds some moisture to the recipe without creating a batter. I think you could swap in sweet potato puree, butternut squash puree, or pumpkin quite easily though the finished product would have a different flavor profile. You could also use oil I would imagine (since you can swap oil for applesauce, the opposite would probably hold true), but it might end up being too heavy.

  1. 5 stars
    Thanks for experimenting with the Simple Mills bread mix! I made these rolls to accompany turkey burgers for our Labor Day celebration and they were delightful!

  2. Ok Just Stahhhp! That looks so dang good. How did I not think of using this mix for this purpose before? Have to try this out ASAP!

  3. 5 stars
    I made these buns tonight and oh my GAH so good! Don’t know why I never thought to make hamburger buns with this mix, but so glad I did! Thanks for changing our burger game!