This is a green bean casserole built on fresh green beans, mushroom soup and sour cream, topped with crispy fried onions. It takes the classic holiday side and swaps in a keto-friendly mushroom soup and keto-friendly fried onions, so a 1 cup serving has 10 grams of carbohydrates, 4 of them fiber. The recipe makes 6 servings and takes 45 minutes in total.
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The beans are boiled briefly, stirred into a creamy mix and baked until bubbly, with the onions on top for crunch. It works as a side for a family dinner or a holiday table.
What Goes in the Casserole
The full amounts are in the recipe card at the bottom.
- Fresh green beans (1 pound, trimmed): they cook quickly and keep a crisp texture and bright color. Fresh gives the best result.
- Mushroom soup (1 cup, keto-friendly): the creamy base. It adds a savory, earthy flavor and binds everything together.
- Sour cream (1/2 cup): adds tang and makes the sauce richer.
- Crispy fried onions (1 cup, keto-friendly): the topping. They give a crunch against the creamy filling.
- Garlic powder (1 teaspoon), salt and pepper: the seasoning.
Making It Work
Boil the green beans for 5 minutes and drain them. Mix the mushroom soup, sour cream, garlic powder, salt and pepper in a large bowl, stir in the beans, and move everything to a baking dish. Top with the fried onions and bake at 350°F (175°C) for 25 minutes, until bubbly and golden.
If you can only get frozen beans, thaw and drain them well first. Extra moisture waters down the sauce. For a little heat, add a pinch of red pepper flakes.
Ways to Change It
- Bacon or chicken: stir cooked bacon bits or shredded chicken into the mixture for more savory depth and more protein.
- Cheese: sprinkle cheddar or mozzarella on top before baking for a cheesy crust.
- Vegetables: add sauteed mushrooms or cauliflower florets. Both keep the dish low in carbohydrates.
- More flavor: onion powder or paprika also work.
What to Serve With It
The casserole goes with roasted chicken or grilled steak, since the creamy sauce balances the richness of the meat. A green salad in a light vinaigrette gives a fresh contrast. For a larger spread, serve it with other keto sides such as cauliflower mash or zucchini noodles. It can also be a vegetarian main dish with a side of sauteed mushrooms or avocado.
Making It Ahead
Assemble the casserole without the crispy onions, cover it and refrigerate. Add the onions on top just before baking, so they stay crunchy. A finished casserole can be reheated in the oven, which makes it easy to prepare for a busy weeknight or a family gathering, and it holds up for meal prep.
How Long It Takes
Prep takes 15 minutes, which covers trimming the beans and mixing the ingredients. Baking takes 30 minutes in all, including the boiling. The total is 45 minutes.
Nutrition per Serving
A serving of 1 cup has approximately 250 calories, 6 grams of protein, 10 grams of carbohydrates, 4 grams of fiber, 20 grams of fat (10 grams saturated), 3 grams of sugar and 450 milligrams of sodium. The sodium is worth balancing with lower-sodium foods through the rest of the day.
FAQ
What makes this green bean casserole keto-friendly?
It replaces the usual high-carbohydrate ingredients with lower-carbohydrate ones. The recipe uses fresh green beans, a keto-friendly mushroom soup and sour cream, with keto-friendly fried onions on top.
Can I make it ahead of time?
Yes. Assemble the casserole without the crispy onions, cover it and refrigerate. When you are ready, add the onions and bake as directed.
Can I add more flavor?
Yes. Add cooked bacon bits, sauteed mushrooms or extra spices such as onion powder or paprika.
Is it good for meal prep?
Yes. It reheats well and goes with a range of proteins, so it works for lunches or dinners during the week.
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Written and edited by The Foodie Yummy Kitchen Team
The Foodie Yummy Kitchen Team writes and edits the recipes on Foodie Yummy: classic American potluck salads, holiday sides and easy comfort food, with a few low-carb options. Every recipe lists exact quantities, numbered steps and a printable recipe card, plus notes on swaps, storage and make-ahead timing. Spot a problem with a recipe? Tell us through the contact page and we will correct it. About us
Keto Green Bean Casserole with Crispy Onions
Ingredients
Instructions
Preheat the oven to 350°F (175°C).
Boil the green beans for 5 minutes and drain them.
In a large bowl, combine the mushroom soup, sour cream, garlic powder, salt, and pepper.
Add the green beans to the mixture and stir well.
Transfer the mixture to a baking dish and top with crispy fried onions.
Bake for 25 minutes or until bubbly and golden.
Notes
For extra flavor, add cooked bacon bits to the mixture.
Can be made ahead and reheated in the oven.
Use fresh green beans for the best texture.
Nutrition
| Serving Size | 1 cup |
|---|---|
| Calories | 250 calories |
| Sugar Content | 3g |
| Sodium Content | 450mg |
| Fat Content | 20g |
| Saturated Fat Content | 10g |
| Unsaturated Fat Content | 8g |
| Trans Fat Content | 0g |
| Carbohydrate Content | 10g |
| Fiber Content | 4g |
| Protein Content | 6g |
| Cholesterol Content | 50mg |