Keto Broccoli and Cauliflower Au Gratin with Sausage

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Creamy, cheesy, and packed with flavor, this Keto Broccoli and Cauliflower Au Gratin with Sausage is the kind of comfort food that keeps you satisfied without knocking you out of ketosis. This low-carb casserole combines tender broccoli and cauliflower florets with juicy sausage bites, all smothered in a rich cheese sauce and baked to golden perfection. It’s simple enough for weeknights, yet special enough to serve to guests.

Whether you’re following a keto lifestyle or just looking for a hearty, guilt-free dinner idea, this dish brings together the best of both worlds: indulgent flavor and smart ingredients. The textures—the crisp edges of roasted vegetables, the creamy sauce, and the savory chunks of sausage—make every bite a little celebration.

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

• Keto-friendly and low-carb: Perfect for anyone on a ketogenic diet.
• One-dish meal: Protein, veggies, and creamy sauce all in one baking dish.
• Make-ahead and freezer-friendly: You can prep it in advance or freeze leftovers.
• Family-approved: Even non-keto eaters will love this savory, cheesy bake.

What Kind of Sausage Should I Use?

You can use any fully cooked sausage for this recipe, but smoked or Italian-style sausage adds the most flavor. Choose mild for a classic taste, or go spicy if you want to kick things up a notch. Chicken sausage or turkey sausage also work well if you’re looking for a lighter option. Just make sure it’s low in sugar to keep it keto-friendly.

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Ingredients for the Keto Broccoli and Cauliflower Au Gratin with Sausage

Each ingredient in this dish has a purpose, creating layers of flavor and keeping it low-carb while deeply satisfying.

• Broccoli florets: Adds crunch, color, and essential nutrients while keeping carbs low.
• Cauliflower florets: Offers a mild flavor and creamy texture when baked.
• Cooked sausage (sliced): Brings in savory richness and hearty protein.
• Heavy cream: Provides the creamy base that ties the dish together.
• Cream cheese: Adds thickness and tang to the sauce.
• Shredded cheddar cheese: Melts into gooey perfection and adds that essential cheesy top.
• Parmesan cheese: Enhances the flavor with a salty, nutty bite.
• Butter: Adds richness and helps sauté the base flavors.
• Garlic (minced): Brings aromatic depth.
• Salt & pepper: Essential for seasoning.
• Optional: Dijon mustard or paprika: For added complexity and warmth.

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 a large baking dish and set it aside.

Step 2: Steam the Veggies

Steam or lightly blanch the broccoli and cauliflower florets for 3-4 minutes until just tender but not soft. Drain well.

Step 3: Sauté the Sausage

In a skillet over medium heat, lightly brown the sliced sausage. This boosts flavor and improves texture.

Step 4: Make the Cheese Sauce

In the same skillet, melt butter and sauté minced garlic until fragrant. Stir in heavy cream and cream cheese. Whisk until smooth, then add half the shredded cheddar and all the Parmesan. Stir until melted and creamy.

Step 5: Combine in Baking Dish

Layer the steamed broccoli, cauliflower, and sausage in the prepared baking dish. Pour the cheese sauce evenly over everything.

Step 6: Top and Bake

Sprinkle the remaining cheddar on top. Bake uncovered for 20-25 minutes or until the top is golden and bubbly.

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How to Serve and Store Keto Broccoli and Cauliflower Au Gratin with Sausage

This hearty dish is perfect as a stand-alone dinner and generously serves 4 to 6 people. If you’re planning a potluck or family gathering, it scales up beautifully too. For storing, let it cool completely, then cover tightly and refrigerate for up to 4 days. To freeze, wrap the cooled casserole in foil and freeze for up to 2 months. Reheat in the oven at 350°F until hot and bubbly.

For meal prep, you can assemble it ahead, refrigerate unbaked, and then bake it fresh when needed. Just add 5-10 extra minutes to the baking time if cooking straight from the fridge.

What to Serve With Keto Broccoli and Cauliflower Au Gratin with Sausage

H3: Fresh Green Salad

A crisp salad with arugula, romaine, or spinach balances the richness of the gratin.

H3: Roasted Asparagus

Keep things low-carb with oven-roasted asparagus drizzled with olive oil and lemon.

H3: Keto Garlic Bread

Almond flour garlic breadsticks are perfect for soaking up the cheesy sauce.

H3: Pickled Vegetables

A side of tangy pickles or pickled onions cuts through the creamy texture of the dish.

H3: Creamy Coleslaw

Add a crunchy, tangy side with a homemade slaw dressed in keto mayo.

H3: Zucchini Noodles

Light and simple, zoodles pair well with the heaviness of this casserole.

H3: Stuffed Mushrooms

Mini mushrooms filled with cheese or sausage mimic the flavors in a bite-sized form.

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Frequently Asked Questions

Can I use frozen vegetables instead of fresh?
Yes, you can use frozen broccoli and cauliflower. Just be sure to thaw and drain them well to avoid excess moisture that can water down the sauce.

Can I make this dish ahead of time?
Absolutely. Assemble it a day in advance and refrigerate until ready to bake. Add a few minutes to the bake time if it’s going in cold.

Is this dish gluten-free?
Yes, this recipe is completely gluten-free as long as your sausage is certified gluten-free. Always double-check packaging if you have a sensitivity.

What cheese can I substitute for cheddar?
Feel free to swap cheddar with mozzarella for a milder flavor or pepper jack for a spicy twist. Gruyere also works great for a gourmet touch.

Save This Pin For Later

Save this recipe to your Pinterest dinner board so you can come back to it any time.
And let me know in the comments how yours turned out. Did you try it with spicy sausage or add a veggie twist?
I love hearing how others make these recipes their own. Questions are welcome too—let’s help each other cook smarter.

Check out more keto-friendly comfort food recipes on my Pinterest: Meals We Share By Sally

Conclusion

Keto Broccoli and Cauliflower Au Gratin with Sausage is the perfect blend of indulgence and nutrition. It’s cheesy, hearty, and absolutely satisfying—without the carb crash. Whether it’s a weeknight family meal or a dish for your next gathering, this one’s guaranteed to become a favorite. Give it a try and enjoy the comfort of a classic gratin made totally keto.

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