Craving something hearty, cheesy, and low in carbs? This Keto Broccoli and Cauliflower Au Gratin with Sausage brings all the comfort of a classic gratin but without the carb-heavy guilt. Perfectly roasted broccoli and cauliflower florets are smothered in a rich, velvety cheese sauce and paired with smoky slices of sausage for a dish that satisfies both your keto goals and your craving for comfort food.

This one-pan meal is more than just weeknight-friendly—it’s loaded with flavor, texture, and nutritional goodness. Whether you’re prepping for a cozy family dinner or a quick lunch meal prep, this dish brings a warm, cheesy hug in every bite. No need to miss out on your favorites while sticking to your low-carb lifestyle.

Why You’ll Love This Keto Broccoli and Cauliflower Au Gratin with Sausage

Low-Carb & Keto Friendly: Every bite supports your keto goals while still tasting indulgent.
One-Pan Simplicity: Less mess and easy cleanup make it perfect for busy days.
Full of Flavor: The combination of smoky sausage and sharp cheese over roasted veggies is pure comfort.
Customizable: You can swap out sausage types or use other veggies like zucchini.
Meal-Prep Approved: Keeps well in the fridge and reheats beautifully.

Preparation Phase & Tools to Use

To make this creamy gratin dish effortless, having the right tools makes all the difference:

Large Skillet or Oven-Safe Pan: Essential for browning sausage and baking the gratin in one dish. A cast-iron skillet works beautifully.
Sharp Chef’s Knife: Helps you get even slices of sausage and clean cuts of veggies.
Steamer Basket (Optional): Speeds up softening the broccoli and cauliflower before baking.
Whisk: Crucial for creating a lump-free cheese sauce.
Mixing Bowl: For combining ingredients evenly before transferring to the pan.

These tools streamline the process, ensuring the vegetables are cooked to tender perfection and the sauce binds everything together in cheesy harmony.

Ingredients for the Keto Broccoli and Cauliflower Au Gratin with Sausage

Broccoli Florets: These bring a fresh, slightly crisp bite and are packed with fiber.
Cauliflower Florets: Mild and tender, they balance the broccoli and absorb the creamy sauce well.
Smoked Sausage (sliced): Adds a savory, smoky element that pairs beautifully with the cheese.
Heavy Cream: The base for a rich, keto-friendly cheese sauce.
Cream Cheese: Helps thicken the sauce and adds a luscious texture.
Shredded Cheddar Cheese: Brings sharp, gooey deliciousness to the gratin.
Parmesan Cheese: Adds a salty depth and forms a golden crust on top.
Garlic Powder & Onion Powder: Flavor enhancers that round out the cheesy mix.
Salt & Pepper: Essential seasonings to balance flavors.
Butter: Used for sautéing and adds richness to the sauce.

How To Make the Keto Broccoli and Cauliflower Au Gratin with Sausage

Step 1: Preheat and Prep

Preheat your oven to 375°F (190°C). Lightly grease your oven-safe skillet or baking dish.

Step 2: Steam the Vegetables

Lightly steam broccoli and cauliflower florets until just tender. You want them firm enough to hold up during baking.

Step 3: Sauté the Sausage

In a large skillet, sauté sliced sausage in butter until browned and slightly crispy. Set aside.

Step 4: Make the Cheese Sauce

In the same skillet, add heavy cream and cream cheese. Whisk until smooth, then stir in cheddar, Parmesan, garlic powder, onion powder, salt, and pepper. Stir until melted and thick.

Step 5: Combine and Layer

Add the steamed veggies and sausage to the cheese sauce. Stir to coat everything well. If not already using an oven-safe skillet, transfer to a baking dish.

Step 6: Bake to Golden Perfection

Sprinkle with extra cheddar and Parmesan, then bake uncovered for 20 minutes or until bubbly and golden on top.

How to Serve and Store This Dish

Serve this gratin hot, straight from the oven. It makes a filling main course on its own or pairs well with a crisp green salad for extra freshness.

To store, let it cool completely before transferring to an airtight container. It will last up to 4 days in the fridge. Reheat in the microwave or oven until warmed through. You can also freeze it in portions for up to 2 months, though the texture of the sauce may slightly change upon thawing.

Frequently Asked Questions

Can I use frozen vegetables instead of fresh?

Yes, just make sure to thaw and drain them well before adding to prevent a watery gratin.

What type of sausage works best?

Smoked kielbasa, andouille, or even turkey sausage work great. Choose one with bold flavor for best results.

Is this recipe gluten-free?

Yes, it’s naturally gluten-free, making it a great option for those avoiding gluten.

Can I make it ahead of time?

Absolutely. Prepare everything up to the baking step, then refrigerate. When ready to eat, just pop it in the oven.

What cheese alternatives can I use?

Try Gruyere for a nuttier flavor or mozzarella for a milder, stretchy texture.

How do I thicken the cheese sauce without flour?

Cream cheese and heavy cream do the trick. Simmering the sauce until it reduces slightly will thicken it beautifully.

Want More Low-Carb Comfort Ideas?

If you love this cheesy, satisfying keto bake, try these next:

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📌 Save this recipe to your Pinterest board so you can come back to it anytime you’re craving cheesy low-carb comfort food.

Let me know how yours turned out! Did you go with spicy sausage or keep it classic? Maybe you added mushrooms or swapped in gouda? I’d love to hear how you made it your own.

And for more daily recipe inspiration, check out my Pinterest: Kitchen By Kate