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Colorado Fried Onion-Mushroom Burgers

In Oklahoma, they have their own fried onion burger. We have Colorado Fried Onion-Mushroom Burgers in our neck of the woods! My mouth is watering! I'll tell ya! There is hardly anything better than fried onions and mushrooms on top of a juicy burger and a hot and steamy roll! 
Course Main Course
Cuisine American
Keyword Hamburgers
Servings 4 people


  • 1 stick butter, divided
  • 8 ounces finely chopped mushrooms
  • 4 cups thinly sliced onions about 2 large onions
  • 1 pound 80/20 ground beef
  • 1 tablespoon Worcestershire sauce
  • 1 teaspoon granulated garlic
  • salt and pepper
  • 4-8 slices swiss cheese or your favorite cheese
  • 4 large hamburger buns


  • Slice the onions in half and thinly slice. Place in a bowl and mix in 1 teaspoon of salt. Let sit for 15-20 minutes. The onions will begin to release liquid. Place on a tea towel and squeeze out as much liquid as possible. Set Aside. 
    Colorado Fried Onion-Mushroom Burgers
  • While the onions are doing their thing, let's make the mushrooms! Finely chop the mushrooms and place in a medium-low preheated (cast iron skillet, if available). Melt the butter and add the mushrooms. Cook for about 5 minutes until the mushrooms begin to brown. Season with a pinch of salt and pepper and remove from the pan and set aside to cool. 
    Colorado Fried Onion-Mushroom Burgers
  • In the same pan, melt another 2 tablespoons of butter over medium-low heat. Add the onions and cook until they become translucent and begin to brown. Remove from pan and set aside. 
    Colorado Fried Onion-Mushroom Burgers
  • When the mushrooms have cooled and the onions are cooking, let's make the hamburgers. In a large bowl combine the hamburger, mushrooms, garlic, Worcestershire, 1/4 teaspoon salt and 1/4 teaspoon pepper. Combine well. Form into 4 equal size balls and set aside. 
  • In the same pan that the onions cooked in melt another 2 tablespoons of butter over medium heat. Depending on the size of your skillet(I had to do 2 batches) place the hamburger ball. Smash down with a heavy spatula (I used the one from my grill). So it's about 1/2 inch thick. Place about 1/2 cup of onions on top of each burger and cook for 3 minutes. Flip the burger over so that the onions are on the bottom. Place a piece of cheese or two on each burger. When the cheese begins to melt, place the buns on top of the cheese like this. Cover with a lid and steam the buns for one minute or so. 
    Colorado Fried Onion-Mushroom Burgers
  • Carefully remove the bottom bun, and slide one burger with onions on top of the burger bun. Top with the other bun and serve!