Cauliflower Au Gratin (Keto Casserole) Recipe
This Keto Cauliflower Au Gratin is a creamy, cheesy casserole that features tender cauliflower slices baked in rich heavy cream and Gruyere cheese. Perfect as a low-carb side dish or comforting main, this recipe offers a deliciously golden cheesy crust with the subtle sweetness of green onions and the nutty richness of Swiss Gruyere.
- Prep Time: 20 minutes
- Cook Time: 1 hour 10 minutes
- Total Time: 1 hour 30 minutes
- Yield: 8 servings
- Category: Casserole
- Method: Baking
- Cuisine: French-inspired
- Diet: Low Carb
Ingredients
Vegetables
- 1 head cauliflower (or 4 cups), cut in slices
- 4 green onions, sliced
Dairy
- 2 cups Swiss Gruyere cheese, shredded (or just Swiss cheese)
- 1 1/2 cups heavy cream
Seasoning
- Salt, to taste
- Black pepper, to taste
Instructions
- Preheat Oven and Prepare Dish: Preheat your oven to 375°F (190°C). Spray an 8×10 inch baking dish with cooking spray to prevent sticking.
- Slice Cauliflower: Slice the cauliflower into thin slices, enough to make about two layers in the baking dish.
- First Layer: Place half of the cauliflower slices evenly in the prepared dish.
- Add Cheese and Onions: Sprinkle half of the shredded Gruyere cheese over the cauliflower layer, then evenly distribute the sliced green onions on top. Season with salt and black pepper to taste.
- Second Layer: Add the remaining cauliflower slices evenly over the first layers.
- Add Cream and Top Cheese: Pour the heavy cream evenly over the layered cauliflower, then top with the remaining shredded cheese.
- Bake Covered: Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes.
- Bake Uncovered: Remove the foil and continue baking for another 40 minutes or until the cauliflower is fork-tender and the cheese has turned golden brown. Check periodically to avoid burning.
- Rest: Let the casserole sit for 5 minutes after baking to thicken before serving.
- Store Leftovers: Store any leftovers in an airtight container and refrigerate.
Notes
- Using Gruyere cheese gives a nutty, rich flavor, but Swiss cheese can be used as an alternative.
- Adjust seasoning to your taste; you can add garlic powder or nutmeg for extra flavor.
- Letting the casserole rest after baking helps it set and improves texture.
- Ensure cauliflower slices are relatively uniform in thickness for even cooking.
- For a lower-fat option, substitute heavy cream with half-and-half, though the texture may be less rich.
