Green Bean Casserole Topped with Crispy Onions Recipe

Atkins Green Bean Casserole Topped with Crispy Onions
Net Carbs
Prep Time: 15 Minutes
Cook Time: 40 Minutes
Phase: Phase 2
Difficulty: Difficult
* Any adjustments made to the serving values will only update the ingredients of that recipe and not change the directions.









calculator How to Calculate Atkins Net Carbs

How to Calculate Atkins Net Carbs

Atkins Net Carbs = Total Carbohydrates – Fiber – Sugar Alcohols/Glycerin (if applicable)



  • 24 oz frozen green beans
  • 6 Tbsp butter, unsalted
  • 24 oz fresh crimini mushrooms
  • 1 tsp fresh garlic
  • 1 tsp table salt
  • 1 cup chicken broth
  • 2 tsp fresh thyme
  • 0 1/2 tsp black pepper, ground
  • 0 1/8 tsp dried cayenne chili pepper, ground
  • 0 1/8 tsp nutmeg, ground
  • 0 1/2 tsp xanthan gum
  • 0 1/2 cup sour cream
  • 0 1/2 cup heavy whipping cream
  • 0 1/2 cup parmesan cheese, grated
  • 1 med fresh onion, mature
  • 1 Tbsp coconut flour, finely ground, organic
  • 0 1/3 cup canola oil


  1. Preheat oven to 350°F. Thaw green beans completely. Place into a 2 ½-quart casserole dish.
  2. In a large sauté pan over medium high heat, warm butter until bubbly. Add sliced mushrooms, minced garlic and salt. Cook mushrooms until all the liquid has evaporated and mushrooms are nicely browned; 15- 20 minutes. Combine with the green beans.
  3. To the sauté pan over medium heat, add chicken broth, thyme, black pepper, cayenne, and nutmeg Sprinkle the xanthan gum over the top and whisk over heat for 1-2 minutes until thickened. Whisk in the sour cream and heavy cream and continue to cook an additional 3 minutes until thoroughly combined and thickened. Poor evenly over the green beans and mushrooms. Top with Parmesan cheese and bake for 20 minutes until bubbly throughout.
  4. While the casserole is cooking, cut the onion into thin slices and separate into rings. Coat evenly with coconut flour and fry in oil over medium high heat in small batches for 1-3 minutes until golden and crispy. Drain away excess oil on a paper towel and continue until all onion rings are fried. Top casserole with onion rings and serve immediately.

You can use fresh green beans for this recipe if desired. Trim ends and blanch in boiling water for 3-5 minutes before draining and adding to the casserole in step 1.

Cooking Tip

Whether you’re feeding a family or cooking for one, you can update the serving settings above to reveal the required amount of ingredients.