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Green Bean Casserole With Gruyere, Fried Leeks, and Onions

Easy green bean casserole is a unique take on a thanksgiving classic. Fresh green beans, homemade mushroom soup, and fried leeks and onions.
Prep Time15 mins
Active Time25 mins
Total Time40 mins
Course: Side Dish, Small Bites
Cuisine: American
Keyword: Easy Meals, Green Beans, Side Dish, Thanksgiving Side Dish
Servings: 8
Author: rylee


Green Bean Casserole

  • 2 lbs. fresh green beans washed and trimmed
  • 8 oz. mushrooms sliced
  • 4 tablespoons Olive & Co. Organic Olive Oil
  • 1 medium sweet/yellow onion diced
  • 4 garlic cloves minced
  • 4 tablespoons all purpose flour
  • 1 ½ cups vegetable broth
  • ¾ cup heavy cream
  • 1 ½ cups gruyere cheese shredded and divided
  • 1 teaspoon soy sauce
  • Salt + pepper to taste

Fried Leeks and Onions

  • 1 small sweet yellow onion thinly sliced
  • 1 medium-large leek thinly sliced and washed well
  • ½ cup all purpose flour
  • 4 tablespoons Olive & Co. Organic Olive Oil
  • Salt to taste


  • Make your fried leeks and onions; Thinly slices leeks and rinse well. Thinly slice your onion and add to a bowl. Drain and dry off the leeks a bit and add to bowl with onions. In a separate bowl add flour.
  • In a large pan over medium heat, add olive oil.
  • Separate the onion and leek slices and dredge in flour. Shake off the excess.
  • In two batches, add onions and leeks to hot pan and cook until golden brown (about 1-2 minutes) then flip and cook on the other side.
  • Transfer to a paper towel lined plate and let them drain.
  • Make casserole; Preheat oven to 400 degrees F.
  • Bring a large pot of salted water to a boil.
  • Once boiling, add green beans to cook for 4-5 minutes, depending on their size. We want them to be just cooked, not mushy.
  • Drain green beans and set aside.
  • In a large pan over medium heat, add olive oil.
  • Add diced onions and a sprinkle of salt and cook 3-4 minutes until softened.
  • Add sliced mushrooms and a sprinkle of salt and cook for 3-4 minutes until just golden.
  • Add garlic and cook for 30 seconds. Whisk in flour and cook for 1 minute.
  • Pour in the vegetable broth and whisk until the flour is incorporated into the broth.
  • Stir in the heavy cream and bring to a simmer to thicken for 2-3 minutes.
  • Whisk in 1 cup of gruyere cheese, soy sauce, and season with salt and pepper to taste.
  • Add the green beans and stir to combine.
  • Add mixture to a 9x13 baking dish, sprinkle with the remaining ½ cup of gruyere cheese, and top with the fried onions and leeks.
  • Bake for 20-25 minutes, or until the filling is bubbling.
  • Let the casserole rest for 5 minutes before serving.