Cheesy Zucchini Gratin
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I first made this Cheesy Zucchini Gratin! (Low Carb) on a hectic weeknight when I needed something comforting, fast, and low on carbs — and it instantly became a go-to. Thinly sliced zucchini bakes in a rich, garlicky cream with Parmesan and a melty cheese topping. It works as a main for a light dinner or a cozy side alongside roasted chicken. If you like layered zucchini dishes, this reminds me of a great baked cheesy zucchini stacks recipe that uses similar techniques.
Why you’ll love this dish
This gratin balances creamy, savory sauce with tender zucchini and a golden, bubbly cheese top. It’s low carb without sacrificing indulgence, and the short ingredient list makes it perfect for quick weeknight cooking or a holiday vegetable side that doesn’t need babysitting.
“Comfort food without the carb overload — rich, cheesy, and surprisingly light.” — a simple review from my dinner guests
Quick wins that make it worth cooking:
- Fast active time: about 15–20 minutes on the stove, 12–15 minutes in the oven.
- Minimal equipment: one large ovenproof skillet.
- Crowd-pleaser: mild enough for kids, flavorful enough for adults.
- Flexible: swap cheeses, use chicken broth instead of beef broth, or make it vegetarian with a veggie broth.
How this recipe comes together
Before you cook, here’s what the process looks like at a glance:
- Sauté onions in butter until they start to caramelize.
- Add garlic briefly, then deglaze with beef broth and stir in heavy cream.
- Melt in grated Parmesan to enrich the sauce.
- Add thin zucchini slices and simmer until just softened.
- Top with your shredded cheese blend and finish in a hot oven until golden brown.
This overview helps you pace the cooking — the stovetop step builds flavor, and the quick bake gives you that irresistible browned cheese.
What you’ll need
- 1 large zucchini, sliced thin and halved into half-moons (aim for 1/8–1/4" thick)
- 1/2 cup freshly grated Parmesan cheese
- 4 tablespoons butter
- 1 small onion, sliced thin
- 1/4 cup beef broth (substitute: chicken or vegetable broth)
- 1 cup shredded cheese of your choice (I used a mozzarella + asiago mix)
- 3 large cloves garlic, minced
- 1/2 teaspoon salt
- 1/2 teaspoon black pepper
- 1/2 cup heavy cream
Notes and substitutions:
- For a vegetarian version, swap the beef broth for a good-quality vegetable broth and keep the Parmesan (not vegetarian if using non-vegetarian rennet — see cheese labels).
- If you want a lighter sauce, use half-and-half, though it won’t be quite as rich.
- For a different texture, try gruyère or sharp cheddar in place of part of the mozzarella/asiago blend.
If you’re exploring casserole-style zucchini dishes, see this cheesy zucchini casserole variations for inspiration.
Step-by-step instructions
- Preheat your oven to 425°F (220°C). Use an ovenproof skillet (cast iron works great).
- Melt 4 tablespoons of butter in the skillet over medium heat.
- Add the thinly sliced onion and cook, stirring occasionally, until the onion is lightly caramelized (about 6–8 minutes).
- Stir in the minced garlic and sauté 30–60 seconds until fragrant—don’t let it burn.
- Pour in 1/4 cup beef broth, then add the 1/2 cup heavy cream. Stir to combine.
- Allow the mixture to come to a gentle bubble, then stir in 1/2 cup freshly grated Parmesan until melted and incorporated.
- Add the sliced zucchini and toss gently to coat. Cook for about 4–5 minutes, until zucchini begins to soften but still holds shape.
- Spread the zucchini mixture evenly in the skillet. Top with 1 cup of your cheese blend, distributing it across the surface.
- Transfer the skillet to the preheated oven and bake 12–15 minutes, until the cheese is melted and begins to brown to your liking.
- Remove from oven and let rest 5 minutes before serving.
Short, clear action verbs and timing help keep the flow smooth — sauté, stir, add, bake, rest.
Best ways to enjoy it
- Serve as a low-carb main with a crisp green salad and roasted cherry tomatoes.
- Use it as a side: pairs very well with grilled or roasted chicken, pork chops, or a lemony fish.
- For a brunch twist, top with a soft-poached egg and a sprinkle of fresh chives.
- To plate: spoon warm gratin onto shallow bowls or a warmed platter and garnish with a little extra grated Parmesan and cracked black pepper.
How to store & freeze
- Refrigerator: Cool completely, then store in an airtight container for up to 3–4 days. Reheat in a 350°F oven until warmed through (about 10–15 minutes) to keep the cheese texture pleasant.
- Freezing: You can freeze the baked gratin in a freezer-safe dish for up to 2 months. Thaw overnight in the refrigerator before reheating. For best texture, reheat uncovered in a 350°F oven until hot.
- Food safety: Reheat leftovers to an internal temperature of 165°F (74°C) before serving. Don’t leave cooked gratin at room temperature longer than 2 hours.
Pro chef tips
- Slice zucchini uniformly so everything cooks evenly. A mandoline or a sharp knife helps.
- Avoid watery zucchini: if your zucchini seems very wet, salt the slices lightly and let them sit 10 minutes, then pat dry. This prevents a soggy sauce.
- Use freshly grated Parmesan for better melt and flavor — pre-grated can contain anti-caking agents that affect texture.
- Cast iron or ovenproof stainless steel works best to go from stove to oven seamlessly.
- If you like a crunchy top, broil for 1–2 minutes at the end — watch closely so it doesn’t burn.
For other cheesy zucchini technique ideas, check this zucchini casserole techniques overview.
Creative twists
- Add protein: stir in cooked crumbled Italian sausage or shredded chicken before baking.
- Herb-forward: mix chopped thyme, rosemary, or basil into the cream for a fragrant lift.
- Low lactose: use lactose-free cream and choose aged hard cheeses, which tend to be lower in lactose.
- Spice it up: add red pepper flakes or a pinch of smoked paprika into the cream for warmth.
- Make it Mediterranean: top with toasted pine nuts and a drizzle of olive oil after baking.
Your questions answered
Q: How long does this take from start to finish?
A: Active stovetop time is about 15 minutes, plus 12–15 minutes in the oven, so plan for roughly 30–35 minutes total.
Q: Can I make this dairy-free or vegan?
A: It’s challenging to replicate the same texture without dairy. Use a coconut cream base and dairy-free shredded cheeses labeled for melting, but expect a different flavor and mouthfeel.
Q: Is this suitable for a low-carb or keto diet?
A: Yes — zucchini and heavy cream keep carbs low while providing richness; choose low-carb cheese blends to stay within keto macros.
Q: Can I prepare this ahead of time?
A: Yes. Assemble the skillet through the topping stage, cover, and refrigerate up to 24 hours. Bake straight from the fridge; you may need an extra 5–8 minutes.
Q: Why use beef broth instead of chicken or vegetable?
A: Beef broth adds deeper umami and rounds out the creaminess, but chicken or vegetable broth is an easy substitute if preferred or to keep it lighter.
Conclusion
For further inspiration and similar low-carb approaches, see this Easy Keto Zucchini Gratin – Low Carb – I Breathe I’m Hungry which offers a comparable cheesy bake. If you want alternative takes on a cheesy zucchini gratin, this Cheesy Keto Zucchini Gratin Recipe! | That Low Carb Life has useful tips. For a version close to the original inspiration, review the original Cheesy Zucchini Gratin! (Low Carb) – My Incredible Recipes. And for one more low-carb gratin with a slightly different spin, check out Zucchini Gratin – Divalicious Recipes.
Enjoy the gratin — it’s simple, satisfying, and a great way to make zucchini shine.
Cheesy Zucchini Gratin
Ingredients
Method
- Preheat your oven to 425°F (220°C). Use an ovenproof skillet (cast iron works great).
- Melt the butter in the skillet over medium heat.
- Add the thinly sliced onion and cook, stirring occasionally, until the onion is lightly caramelized (about 6–8 minutes).
- Stir in the minced garlic and sauté for 30–60 seconds until fragrant—don’t let it burn.
- Pour in the beef broth, then add the heavy cream. Stir to combine.
- Allow the mixture to come to a gentle bubble, then stir in the Parmesan until melted and incorporated.
- Add the sliced zucchini and toss gently to coat. Cook for about 4–5 minutes, until zucchini begins to soften but still holds shape.
- Spread the zucchini mixture evenly in the skillet. Top with the cheese blend, distributing it across the surface.
- Transfer the skillet to the preheated oven and bake for 12–15 minutes, until the cheese is melted and begins to brown.
- Remove from oven and let rest for 5 minutes before serving.
