This creamy, cheesy keto au gratin pairs tender broccoli and cauliflower with savory sausage for a rich, low-carb comfort dish. It browns on top, smells garlicky and buttery, and delivers a velvety sauce that clings to each floret. If you want an easy weeknight main or a hearty side for a special meal, this dish checks the boxes.
I also keep a detailed version of the Keto Broccoli and Cauliflower Au Gratin with Sausage recipe handy when I cook this for a crowd.
Recipe Information
- Prep Time: 15 minutes
- Cook Time: 35 minutes (5–7 minutes sauté + 25–30 minutes baking)
- Total Time: 50 minutes
- Servings: 4
- Difficulty Level: Easy
Nutrition Information
(Approximate per serving)
- Calories per serving: 540 kcal
- Protein: 23 g
- Carbohydrates: 8.5 g
- Fat: 46 g
- Fiber: 2.5 g
- Sugar: 1.5 g
- Sodium: 800 mg
Why Make This Keto Broccoli and Cauliflower Au Gratin with Sausage
This recipe is a satisfying low-carb meal that still feels indulgent. The cream and cheese create a silky sauce that coats the vegetables. Sausage adds savory depth and protein so it stands in as a main dish. It browns beautifully in the oven, giving you a golden, bubbling top with crisp edges and soft, tender florets underneath. The dish is easy to scale, makes great leftovers, and fits well into a keto meal plan.
How to Make Keto Broccoli and Cauliflower Au Gratin with Sausage
You’ll quickly sauté the vegetables, mix a rich cream sauce, layer everything, then bake until bubbly and golden. Small steps, clear flavors, and simple technique keep this recipe approachable for cooks at any skill level.
Ingredients:
- 2 cups broccoli florets
- 2 cups cauliflower florets
- 1 cup cooked sausage, crumbled
- 1 cup heavy cream
- 1 cup shredded cheese (cheddar or mozzarella)
- 1/2 cup grated Parmesan cheese
- 1 teaspoon garlic powder
- Salt and pepper to taste
- 1 tablespoon olive oil or butter
Directions:
Step 1: Preparation
Preheat the oven to 375°F (190°C). Rinse and pat dry the broccoli and cauliflower. If your sausage is raw, cook it in a skillet until browned, then crumble and drain any excess fat. Measure and shred the cheese if needed.
Step 2: Mixing
In a mixing bowl, combine the heavy cream, garlic powder, a pinch of salt, pepper, and half of the shredded cheese. Stir until smooth. This is your creamy sauce that will soak into the vegetables and sausage.
Step 3: Cooking
In a large skillet, heat the olive oil or butter over medium heat. Add the broccoli and cauliflower and sauté 5–7 minutes until they are slightly tender and bright in color. This pre-cook keeps the vegetables from becoming mushy in the oven.
Step 4: Finishing
Layer the sautéed vegetables and crumbled sausage in a baking dish. Pour the cream mixture evenly over the top. Sprinkle the remaining shredded cheese and the grated Parmesan across the surface. Bake 25–30 minutes until the sauce is bubbling and the top turns golden. Let the dish cool for a few minutes before serving so the sauce sets.
How to Serve Keto Broccoli and Cauliflower Au Gratin with Sausage
Serve hot, spooned into plates so each portion gets cheesy crust and creamy veg. Pair it with a crisp green salad or a simple side of sautéed greens for a lighter contrast. For a holiday or dinner party, place it alongside roasted chicken or a juicy steak. Garnish with chopped fresh parsley for color and a bright finish.
How to Store Keto Broccoli and Cauliflower Au Gratin with Sausage
- Refrigerator: Store in an airtight container for 3–4 days. Reheat in a 350°F (175°C) oven covered with foil until warmed through, or microwave individual portions.
- Freezer: Freeze in a freezer-safe container for up to 2 months. Thaw overnight in the fridge before reheating. Reheat gently to preserve sauce texture.
- Tip: Let the dish cool to room temperature before sealing to avoid soggy topping from trapped steam.
Expert Tips for Perfect Keto Broccoli and Cauliflower Au Gratin with Sausage
- Use pre-cooked sausage to save time and control doneness. Crumble it small so it mixes evenly.
- Don’t over-sauté the vegetables. Slight tenderness keeps them from turning mushy after baking.
- If you see excess liquid in the skillet, drain a little before layering to prevent a thin sauce.
- For a thicker sauce, stir in 2 oz cream cheese with the heavy cream. It makes the filling extra velvety.
- For a crispier top, broil 1–2 minutes at the end—watch closely to avoid burning.
- Use low-sodium sausage or reduce added salt if you watch sodium intake.
Delicious Variations
- Vegetarian: Omit the sausage and add sliced mushrooms or spinach. Add a touch more cheese for richness.
- Bacon and Leek: Swap sausage for crispy bacon and folded-in cooked leeks for a smoky twist.
- Spicy: Use spicy Italian sausage and add a pinch of red pepper flakes to the cream.
- Herb-Forward: Mix a tablespoon of chopped fresh thyme or rosemary into the cream for aromatic notes.
- Creamier Sauce: Add 2 oz cream cheese or 1/4 cup mascarpone to the cream mixture for a thicker, silkier texture.
Frequently Asked Questions
Q: Can I make this ahead of time?
A: Yes. Assemble the dish but do not bake it. Cover and refrigerate up to 24 hours. Add a few extra minutes to the baking time when you cook it from chilled.
Q: Can I use raw sausage in the dish?
A: You should cook raw sausage first. Crumble and brown it fully, then drain excess fat before layering; raw sausage will release juices and affect texture.
Q: How do I reduce carbs further?
A: Use a bit more cauliflower and less broccoli, as cauliflower is slightly lower in carbs. Keep the heavy cream and cheese for fat. Also reduce portion size to lower carbs per serving.
Q: Why is my casserole watery after baking?
A: That usually means the vegetables released moisture or the cream was too thin. To prevent this, sauté vegetables until just tender and drain any excess liquid. Stirring in some cream cheese or reducing the cream slightly can help.
Q: Can I freeze leftovers and how best to reheat them?
A: Yes. Freeze in airtight containers for up to 2 months. Thaw overnight in the fridge, then reheat covered in a 350°F (175°C) oven until warmed through. Microwaving works for single portions but may soften the topping.
Q: Is there a low-lactose option?
A: Try lactose-free cream and cheeses or substitute full-fat coconut cream for heavy cream (it will change the flavor slightly). Use a dairy-free shredded cheese if needed, though texture will differ.
Conclusion
This Keto Broccoli and Cauliflower Au Gratin with Sausage is a cozy, low-carb dish that’s creamy, savory, and simple to make. It gives you a golden, bubbling top and tender, flavorful vegetables below. Try it for a weeknight dinner or a holiday side—its make-ahead ease and strong flavor make it a winner. Enjoy cooking, and feel free to tweak the seasonings to make it your own.
Print
Keto Broccoli and Cauliflower Au Gratin with Sausage
- Total Time: 50
- Yield: 4 servings 1x
- Diet: Low-Carb
Description
A rich and creamy keto dish featuring tender broccoli and cauliflower paired with savory sausage, perfect for a low-carb comfort meal.
Ingredients
- 2 cups broccoli florets
- 2 cups cauliflower florets
- 1 cup cooked sausage, crumbled
- 1 cup heavy cream
- 1 cup shredded cheese (cheddar or mozzarella)
- 1/2 cup grated Parmesan cheese
- 1 teaspoon garlic powder
- Salt and pepper to taste
- 1 tablespoon olive oil or butter
Instructions
- Preheat the oven to 375°F (190°C). Rinse and pat dry the broccoli and cauliflower. If your sausage is raw, cook it in a skillet until browned, then crumble and drain any excess fat. Measure and shred the cheese if needed.
- In a mixing bowl, combine the heavy cream, garlic powder, a pinch of salt, pepper, and half of the shredded cheese. Stir until smooth.
- In a large skillet, heat the olive oil or butter over medium heat. Add the broccoli and cauliflower and sauté for 5–7 minutes until slightly tender and bright in color.
- Layer the sautéed vegetables and crumbled sausage in a baking dish. Pour the cream mixture evenly over the top. Sprinkle the remaining shredded cheese and the grated Parmesan across the surface. Bake for 25–30 minutes until bubbling and golden. Let cool for a few minutes before serving.
Notes
Pairs well with a crisp green salad or sautéed greens. Can be made ahead of time and refrigerated for up to 24 hours before baking.
- Prep Time: 15
- Cook Time: 35
- Category: Main Course
- Method: Baking
- Cuisine: Keto
Nutrition
- Serving Size: 1 serving
- Calories: 540
- Sugar: 1.5g
- Sodium: 800mg
- Fat: 46g
- Saturated Fat: 20g
- Unsaturated Fat: 24g
- Trans Fat: 0g
- Carbohydrates: 8.5g
- Fiber: 2.5g
- Protein: 23g
- Cholesterol: 120mg
