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keto green bean casserole close up with mushroom cream sauce

Homemade Keto Green Bean Casserole

This keto green bean casserole is homemade from scratch! Using a authentic mushroom and onion cream sauce, topped with parmesan chips. It's so easy to make for a keto fall recipe, Thanksgiving or just to have as a delicious low carb casserole dish.
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Prep Time 20 mins
Cook Time 40 mins
Servings 6 people
Calories 127 kcal


  • 2.5 cups cut green beans (can range anywhere from 2-3 cups is ideal)
  • 1/2 white onion
  • 8 oz sliced mushrooms
  • 1/4 cup white wine vinegar
  • 1/2 cup chicken bone broth (regular chicken broth is fine)
  • 1 cup heavy cream (or coconut cream)
  • 1 tablespoon unsalted butter
  • 1 teaspoon salt
  • 1 teaspoon coarse black pepper
  • 2 tablespoon olive oil

optional for cream thickness. One or the other

  • 1/8 teaspoon xanthan gum
  • 1/4 cup shredded cheese


  • If using canned string beans proceed to step 4. Wash and cut string beans up to desired size
  • Boil string beans to soften. About 5-10 minutes. Don't overcook because they will cook in the oven as well.
  • After finish boiling drain them then make cream sauce for casserole.
  • Sliced onion and mushrooms. On medium heat sweat the mushrooms to remove excess water.
  • After they are done add in olive oil and toss in sliced onions then season with salt and pepper.
  • Cook mushrooms and onions down then add in butter and allow to melt then incorporate.
  • Pour in white wine vinegar and allow the vinegar to completley reduce making sure you don't burn anything watch the heat. If onions/mushrooms look dry add a little oil but they shouldn't.
  • After vinegar has reduced add broth to the pan. Bring to boil then lower to simmer and reduce by half.
  • Pour in heavy cream and reduce to simmer as well. Allow to thicken. If you want a thicker sauce since there is no roux add in 1/8 tsp xanthan gum or 1/4 cup of cheese of choice.
  • Preheat oven to 300ºF then layer string beans in casserole dish.
  • Mix in cream sauce and string beans then bake for 20 minutes. Allow to cool then serve.


Helpful Recipe Tips

  • Adding cheese or xanthan gum for thickness is a great option. Having the inability to make a roux it will take forever to cook the water out of the cream. To speed up the process adding in cheese or xanthan gum is your best friend. 
  • Using canned string beans to make the recipe even faster to make!
  • Skipping the parmesan chips. They are only optional for a crunchy topping but they don't add the same element the onion straws do. Although you can purchase onion flavored chips to help.


Nutrition Facts
Homemade Keto Green Bean Casserole
Amount Per Serving
Calories 127
* Percent Daily Values are based on a 2000 calorie diet.
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