When it comes to holiday dinner spread, it’s all about the sides. This easy homemade keto green bean casserole is a simple dish with fresh ingredients anyone can enjoy!
What is Green Bean Casserole?
The American side dish served at Christmas, Thanksgiving, and Easter holidays was developed by Campbell’s test kitchen in the sixties. To this day, families celebrate with canned green beans, canned cream of mushroom soup, and packaged French fried onions (so addicting).
Ingredients You’ll Need
- Cream of Mushroom Soup: Use store-bought cream of mushroom or prepare homemade keto cream of mushroom soup. I use unsalted butter, white onion, fresh garlic cloves, mushrooms, xanthan gum, dried thyme, kosher salt, coarse black pepper, beef broth, sherry vinegar, and heavy cream to make my own soup from scratch.
- Oil and Butter: Saute the onions in extra-virgin olive oil and unsalted butter.
- Onion: Since keto green bean casserole isn’t a dish I am making everyday, I don’t mind cooking with onions while following a ketogenic way of eating. You can top the green bean casserole with crushed pork rinds or parmesan crisps for a lower-carb option.
- Green Beans: Fresh green beans produce the best results.
- 1 tablespoon extra-virgin olive oil
- 1 tablespoon unsalted butter
- 2 medium yellow onions, thinly sliced
- 1 pound green beans, ends removed, and cut in half
Additions and Substitutions
- Experiment with mix-ins. Include crispy bacon bits or cream cheese for even more flavor.
- Top it off. Garnish the keto green bean casserole with crushed almonds or shredded cheddar cheese.
How to Make Keto Green Bean Casserole
The full recipe with measurements is in the recipe card below.
Prepare the Cream of Mushroom Soup
Step 1: Warm unsalted butter in a saute pan over medium heat. Add the onions and saute until they become translucent and soften. Stir in the garlic and cook for one minute.
Step 2: Add the mushroom slices and saute for 5 minutes. Then, stir in the xanthan gum, dried thyme, kosher salt, and black pepper.
Step 3: Deglaze the pan with sherry vinegar and beef broth. Bring the mixture to a bowl over medium heat.
Reduce the heat, cover, and gently simmer for 10 minutes until the soup thickens.
Step 4: Remove the pan from heat and stir in the heavy cream.
Assemble the Green Bean Casserole
Step 1: Meanwhile, warm a large skillet over medium-low heat for two minutes. Add the olive oil and butter and cook until the butter melts.
Then, add the onions. Saute the onions for 20-25 minutes until they brown and become crispy.
Step 2: Use a slotted spoon to transfer the crispy onions to a plate lined with paper towels and set them aside.
Step 3: Preheat the oven to 350°F (176°C). Prepare a baking dish with unsalted butter or cooking spray and arrange the green beans into the bottom of the pan.
Step 4: Top the green beans with the keto cream of mushroom soup. Cover the baking dish with foil and bake for 15 minutes.
Remove the foil, add the reserved onions, and bake uncovered for 15 minutes.
If you enjoy keto green bean casserole, try even more keto recipes!
Serving Suggestions
Serve this homemade keto green bean casserole alongside holiday favorites like tandoori turkey, prime rib, za’atar turkey, and glazed ham. Pair it with other low-carb sides cheesy mashed cauliflower and a hearty fall kale salad. And don’t think low-carb means skipping dessert—complete the meal with a cozy keto apple crisp.
What To Do With Leftovers
- Refrigerate: Store leftovers in an airtight container for 3-4 days.
- Reheat: Warm the casserole in the oven for the best results.
Frequently Asked Questions
Are traditional green bean casseroles keto?
Most traditional recipes use canned cream of mushroom soup. The store-bought cans contain flour and cornstarch, and they can increase the number of carbs in the dish. Additionally, canned green beans are higher in carbs than fresh green beans.
Can green bean casserole be made ahead?
Holiday meals can get hectic, but this casserole is a breeze to make ahead. Store the casserole and the crispy fried onions separately for the best results.
You can keep the onions in an airtight container or paper bag on the counter and refrigerate the green bean and mushrooms soup mixture up to 2 days ahead.
When it’s time to serve, let the casserole sit at room temperature for 30 minutes before baking. Then, pop it in the oven and bake as directed for a stress-free side dish.
More Fall Recipes:
Keto Green Bean Casserole
- 4 tablespoons unsalted butter
- ½ medium white onion, diced
- 4 garlic cloves, minced
- 1½ pounds mushrooms, sliced
- ½ teaspoon xanthan gum
- 4 teaspoons dried thyme
- 1 teaspoon kosher salt
- 1 teaspoon coarse black pepper
- 4¼ cups beef broth
- 2 tablespoons sherry vinegar
- 1 cup heavy cream
- 1 tablespoon extra-virgin olive oil
- 1 tablespoon unsalted butter
- 2 medium yellow onions, thinly sliced
- 1 pound green beans, ends removed, and cut in half
For the Cream of Mushroom Soup:
- Warm unsalted butter in a saute pan over medium heat. Add the onions and saute until they become translucent and soften. Stir in the garlic and cook for one minute.
- Add the mushroom slices and saute for 5 minutes. Then, stir in the xanthan gum, dried thyme, kosher salt, and black pepper.
- Deglaze the pan with sherry vinegar and beef broth. Bring the mixture to a bowl over medium heat. Reduce the heat, cover, and gently simmer for 10 minutes until the soup thickens.
- Remove the pan from heat and stir in the heavy cream.
For the Green Bean Casserole:
- Meanwhile, warm a large skillet over medium-low heat for two minutes. Add the olive oil and butter and cook until the butter melts. Then, add the onions. Saute the onions for 20-25 minutes until they brown and become crispy.
- Use a slotted spoon to transfer the crispy onions to a plate lined with paper towels and set them aside.
- Preheat the oven to 350°F (176°C). Prepare a baking dish with unsalted butter or cooking spray and arrange the green beans into the bottom of the pan.
- Top the green beans with the keto cream of mushroom soup. Cover the baking dish with foil and bake for 15 minutes.
- Remove the foil, add the reserved onions, and bake uncovered for 15 minutes.
Laura
Monday 13th of February 2023
I made this Keto Green Bean Casserole for our family dinner and it was a hit! The creamy and rich flavor of the homemade casserole was so much better than the canned version. And it was great to be able to serve a keto-friendly dish during the holidays. Thank you for sharing this recipe!