Mushroom Swiss Onion Smashburgers

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JC in GB

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Sep 28, 2018
Green Bay, WI
Good day all. I was wondering what to make for dinner when the wife pointed out that we had burger buns, mushrooms, and thawed burger in the fridge. So my brain started turning and I thought, hey!, Mushroom Swiss onion smashburgers. I made a mushroom gravy. (Recipe at end of post) I made 3 oz burger balls for the burgers. Sliced some onions wafer thin and set out to the Blackstone griddle. Here is my finished product. These were stone cold delicious. I had to stop myself from eating two.

Mushroom Swiss Onion Smashburger.jpg

Mushroom Gravy:

8 oz mushrooms - chopped into small pieces
7 T butter
1/3 c Flour
1 c Chicken broth
1 c Beef broth
2 T Ketchup
1 T Worcestershire Sauce
Garlic powder
Black Pepper

Using 5 T of the butter and the flour, make a roux. Sautee the mushrooms in the remaining 2 T of butter; add garlic and black pepper to taste. Whisk beef and chicken broth into the roux then add mushrooms, ketchup and Worcestershire sauce. Stir on heat until thickened. This gravy will be quite thick as it needs to hang onto the burger. Enjoy.

JC :emoji_cat:


SMF Hall of Fame Pitmaster
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Jun 22, 2009
Central Florida (Sebring)
Looks like you took smash burgers to a new level!
As you know I am a mushroom gravy freak and that looks amazing!
Nicely done!
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Smoking Guru
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Apr 17, 2020
Southaven, MS
Man you stopped yourself from eating two!?!?!? Good Lord I'd eat two and lick that gravy out the pot!!! Mighty fine burgers.

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Master of the Pit
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Nov 16, 2016
Sandusky, OH
Looks fantastic! Funny, back when I saw the OK burgers I thought this exactly only difference was no buns (so I could call it keto and eat 2) LOL
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Master of the Pit
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Feb 25, 2018
E Tn
Looks great. I cheat on the mushroom slicing, I have 1 of the wire egg slicers, it works very well and can go through a bunch in a short time all the perfect thickness.
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tx smoker

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Apr 14, 2013
Lago Vista, Texas
Man that looks good!! Don't know how you kept it all on the bun, but I'd have happily licked the plate clean of any that fell off if I had that in front of me. Very nice!!

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