Keto Slow Cooker Green Bean Casserole
This comforting slow cooker green bean casserole transforms the classic holiday side dish into an easy, hands-off recipe perfect for busy entertaining. Fresh or frozen green beans are bathed in a creamy mushroom sauce enriched with sour cream and seasonings, then topped with crispy fried onions for that signature crunch. The crockpot method ensures tender beans and a perfectly bubbly sauce without the need for oven space, making it ideal for holiday gatherings when your oven is already full. Optional cheddar cheese adds extra richness to this family-friendly favorite.
Ingredients
- 2 pounds fresh or frozen green beans, trimmed and cut into bite-sized pieces
- 2 cans (10.5 ounces each) cream of mushroom soup
- 1 cup sour cream
- ½ cup milk
- 1 teaspoon soy sauce
- 1 teaspoon garlic powder
- ½ teaspoon onion powder
- ½ teaspoon black pepper
- ¼ teaspoon salt, adjust to taste
- 1 cup shredded cheddar cheese(optional)
- 1 can (6 ounces) crispy fried onionstoasted breadcrumbs1:1texture
different crunch
Instructions
- 1
Blanch fresh green beans in boiling water for 2-3 minutes, then drain and set aside, or use frozen green beans directly
- 2
Whisk together cream of mushroom soup, sour cream, milk, soy sauce, garlic powder, onion powder, black pepper, and salt in a mixing bowl until well combined
- 3
Add green beans to slow cooker and pour mushroom sauce over top, stirring to combine
- 4
Sprinkle shredded cheddar cheese on top if using
- 5
Cover and cook on low for 4-5 hours or on high for 2-3 hours until green beans are tender and sauce is bubbly
- 6
Sprinkle crispy fried onions evenly over top about 15-20 minutes before serving
- 7
Cover and continue cooking until onions are heated through and slightly crisped
- 8
Serve hot straight from the slow cooker
Tips
Use frozen green beans to save prep time - they can go straight into the slow cooker without blanching.
Add the crispy onions in the final 15-20 minutes to maintain their crunch and prevent them from getting soggy.
For extra richness, stir in the optional cheddar cheese during the last hour of cooking for perfect melting.
Good to Know
Refrigerate leftovers for up to 3 days in covered container. Reheat in microwave or oven until heated through.
Prepare sauce and blanch beans up to 1 day ahead. Assemble in slow cooker morning of serving.
Serve hot as holiday side dish alongside turkey, ham, or roast. Keep warm in slow cooker on warm setting.
Common Mistakes
Add crispy onions early to avoid soggy, overcooked topping that loses its crunch.
Overcook green beans to avoid mushy texture - check for tender-crisp doneness.
Skip blanching fresh beans to avoid undercooked, tough vegetables in final dish.
Substitutions
different crunch
softer texture
FAQ
Can I make this ahead of time?
Yes, prepare the sauce and blanch beans up to 1 day ahead. Assemble in slow cooker the morning you plan to serve for best results.
Can I freeze this casserole?
Freezing is not recommended as the dairy-based sauce may separate and the green beans can become mushy when thawed and reheated.
What if I don't have crispy fried onions?
Substitute with toasted breadcrumbs, crushed crackers, or make your own by frying thinly sliced onions until golden and crispy.