Creamy, cheesy, and packed with protein, this keto broccoli and cauliflower au gratin with sausage is the ultimate low-carb comfort dish. It brings together tender vegetables, savory sausage, and a luscious cheese sauce that bubbles into golden perfection. Whether you’re cooking for a weeknight dinner or prepping a hearty meal ahead, this recipe delivers flavor without the carb overload.

This dish is layered with texture: the crisp-tender bite of broccoli and cauliflower contrasts beautifully with the rich and gooey cheese blanket. The addition of sausage adds a smoky, meaty kick that turns this side dish into a satisfying main course. It’s also a great way to sneak in more veggies without feeling like you’re missing out.

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

You get all the indulgence of a traditional gratin without the heaviness of potatoes or breadcrumbs. It fits right into a keto or low-carb lifestyle, and it’s a one-pan wonder that delivers on both taste and nutrition. Plus, it’s incredibly customizable—you can switch out the sausage or play with different cheeses to suit your mood or what’s in your fridge.

What Kind of Sausage Should I Use?

For this recipe, a smoked or pre-cooked sausage works best because it brings an instant depth of flavor and saves time. You can use kielbasa, andouille, or even spicy Italian sausage. If you prefer to keep things lighter, chicken sausage is a great alternative. Just be sure to slice it thinly or crumble it before adding it to the dish.

Ingredients for the Keto Broccoli and Cauliflower Au Gratin with Sausage

To make this creamy, cheesy bake come together, you’ll need a few everyday ingredients that play specific roles in flavor and texture.

Broccoli – Adds fiber and nutrients while holding up well in baking without turning mushy.

Cauliflower – Provides a mild, creamy base that absorbs the flavors of the cheese and sausage beautifully.

Sausage – Adds savory depth and protein, making this dish more filling and flavorful.

Heavy Cream – The secret to a rich and silky cheese sauce without using flour or starches.

Cheddar Cheese – Melts into the cream, creating a sharp, tangy sauce.

Mozzarella Cheese – Offers that irresistible stretchy, gooey texture on top.

Cream Cheese – Helps thicken the sauce and gives a slight tang.

Garlic Powder – Rounds out the flavor profile with savory warmth.

Salt and Pepper – Essential for balancing all the flavors.

Keto Broccoli and Cauliflower Au Gratin with Sausage 2

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

Step 1: Prep the Veggies

Lightly steam the broccoli and cauliflower until they’re just fork-tender. You want them cooked but still holding their shape, since they’ll continue to cook in the oven.

Step 2: Sauté the Sausage

Slice or crumble your sausage and brown it in a skillet until it gets that caramelized edge. This boosts the flavor and gives it a little crispness.

Step 3: Make the Cheese Sauce

In a saucepan over medium heat, combine heavy cream, cream cheese, cheddar, and a pinch of garlic powder. Stir until melted and smooth. Taste and season with salt and pepper.

Step 4: Assemble and Bake

Layer the steamed veggies in a baking dish, followed by the cooked sausage. Pour the cheese sauce over the top and sprinkle with mozzarella. Bake at 375°F (190°C) for 20 minutes until bubbly and golden.

Step 5: Let It Rest

Give the gratin a few minutes to set before serving. This helps the sauce thicken a bit and makes it easier to portion.

How to Serve and Store This Low-Carb Gratin

This dish serves about 4 to 6 people, depending on whether it’s a main or a side. It’s rich enough to stand alone but also works beautifully alongside other keto-friendly options. If you have leftovers, store them in an airtight container in the refrigerator for up to 4 days. Reheat in the oven or microwave, though the oven gives the cheese a better melt and re-crisp.

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

Herb-Rubbed Roast Chicken

Pair with roast chicken to make a cozy, Sunday-style dinner without the carbs.

Garlic Butter Zucchini Noodles

Add a light, fresh side to balance the richness of the cheese sauce.

Arugula Salad with Lemon Vinaigrette

A peppery salad cuts through the creaminess and brightens the meal.

Spaghetti Squash Carbonara

Double up on keto comfort with another cheesy but veggie-forward main.

Roasted Brussels Sprouts

Crispy Brussels sprouts bring texture and deep roasted flavor that pairs well.

Keto Cloud Bread

Use this fluffy bread alternative to soak up every bit of that cheese sauce.

Cauliflower Fried Rice

Keep the low-carb theme going with a savory cauliflower rice mix.

Stuffed Bell Peppers

For meal prep or variety, this combo can turn into a next-day feast.

Want More Low-Carb Dinner Ideas?

If you loved this keto gratin, check out more savory recipes like these:

Save This Recipe For Later

📌 Save this recipe to your Pinterest keto board so you can come back to it any time.

And let me know in the comments how yours turned out. Did you go spicy with the sausage? Try a different cheese blend? I love hearing how you put your own spin on it.

Explore beautifully curated health-boosting dinners and more on Luna Meals on Pinterest and discover your new go-to for feeling great! Luna Meals on Pinterest

Conclusion

This keto broccoli and cauliflower au gratin with sausage checks all the boxes: hearty, flavorful, cheesy, and comforting. It proves you don’t need carbs to enjoy a decadent and soul-warming meal. Whether you’re feeding a hungry family or just meal prepping for the week, this dish brings big satisfaction with minimal effort.

Keto Broccoli and Cauliflower Au Gratin with Sausage

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

What Kind of Sausage Should I Use?

Ingredients for the Keto Broccoli and Cauliflower Au Gratin with Sausage