Keto Lasagna With Zucchini Noodles – A Comforting Low-Carb Classic
If you’re craving a cozy, cheesy lasagna without the carb crash, this version hits the spot. Thin-sliced zucchini stands in for pasta, layered with savory meat sauce and a rich, creamy cheese blend. It’s hearty enough for a family dinner, yet light enough to keep you feeling good afterward.
You’ll get all the classic lasagna flavors—tomato, garlic, Italian herbs, and plenty of melty cheese—without the heaviness. It’s also a great way to use up garden zucchini and still feel like you’re eating something indulgent.
Ingredients
Method
- Prep the zucchini: Slice zucchini lengthwise using a mandoline or a sharp knife. Lay slices on a sheet pan, sprinkle with salt, and let sit 15–20 minutes to draw out moisture. Pat dry with paper towels.
- Par-cook the zucchini: Brush slices lightly with olive oil and arrange on two lined sheet pans. Bake at 400°F (200°C) for 10–12 minutes, flipping halfway, until just tender. This step keeps your lasagna from getting watery.
- Make the meat sauce: Heat 1 tablespoon olive oil in a large skillet over medium heat. Add onion and cook 3–4 minutes until softened. Stir in garlic for 30 seconds.
- Brown the meat: Add ground beef (and sausage if using). Cook, breaking it up, until browned with no pink remaining. Drain excess fat if needed.
- Season and simmer: Stir in crushed tomatoes, tomato paste, Italian seasoning, red pepper flakes, salt, and pepper. Simmer uncovered 10–15 minutes to thicken. Taste and adjust seasoning.
- Mix the ricotta layer: In a bowl, combine ricotta, egg, chopped parsley or basil, a pinch of salt, and black pepper. Stir until smooth.
- Assemble the lasagna: Lower oven to 375°F (190°C). Spread a thin layer of meat sauce in a 9x13-inch baking dish. Add a layer of zucchini slices, slightly overlapping. Dollop and spread half the ricotta mixture over the zucchini. Sprinkle with one-third of the mozzarella and some Parmesan. Repeat layers: sauce, zucchini, ricotta, and cheeses.
- Top and bake: Finish with a final layer of zucchini, the remaining meat sauce, and the rest of the mozzarella and Parmesan. Cover loosely with foil (tent it so cheese doesn’t stick) and bake 20 minutes.
- Uncover to brown: Remove foil and bake another 10–15 minutes until the cheese is bubbly and golden at the edges.
- Rest before slicing: Let the lasagna sit 10–15 minutes. This helps it set so slices hold together.
- Garnish and serve: Sprinkle with fresh basil or parsley. Cut into squares and serve warm.
Why This Recipe Works
This lasagna swaps noodles for zucchini slices, which cut down on carbs while keeping the structure and layers you expect. The trick is to salt, rest, and pre-bake the zucchini to reduce moisture, preventing a watery casserole.
A blend of ricotta, mozzarella, and Parmesan adds creaminess and stretch, so you never miss the pasta. Finally, a robust meat sauce delivers depth and richness that balances the freshness of the zucchini.
What You’ll Need
- Zucchini: 3–4 medium zucchini, sliced lengthwise into thin planks (about 1/8–1/6 inch thick)
- Olive oil: 2 tablespoons, for sautéing and brushing zucchini
- Ground beef: 1 pound (85–90% lean)
- Italian sausage (optional): 1/2 pound, casings removed (adds extra flavor)
- Yellow onion: 1 small, finely diced
- Garlic: 3 cloves, minced
- Crushed tomatoes or low-sugar marinara: 2 cups (look for no added sugar)
- Tomato paste: 1 tablespoon (for richness)
- Italian seasoning: 2 teaspoons
- Red pepper flakes: Pinch (optional)
- Salt and black pepper: To taste
- Ricotta cheese: 1 1/2 cups (whole milk for best texture)
- Egg: 1 large (binds the ricotta layer)
- Fresh parsley or basil: 2 tablespoons, chopped (plus more for garnish)
- Mozzarella cheese: 2 cups shredded
- Parmesan cheese: 1/2 cup grated
- Optional add-ins: Sliced mushrooms, chopped spinach (well squeezed), or sliced olives
Instructions
- Prep the zucchini: Slice zucchini lengthwise using a mandoline or a sharp knife. Lay slices on a sheet pan, sprinkle with salt, and let sit 15–20 minutes to draw out moisture.
Pat dry with paper towels.
- Par-cook the zucchini: Brush slices lightly with olive oil and arrange on two lined sheet pans. Bake at 400°F (200°C) for 10–12 minutes, flipping halfway, until just tender. This step keeps your lasagna from getting watery.
- Make the meat sauce: Heat 1 tablespoon olive oil in a large skillet over medium heat.
Add onion and cook 3–4 minutes until softened. Stir in garlic for 30 seconds.
- Brown the meat: Add ground beef (and sausage if using). Cook, breaking it up, until browned with no pink remaining.
Drain excess fat if needed.
- Season and simmer: Stir in crushed tomatoes, tomato paste, Italian seasoning, red pepper flakes, salt, and pepper. Simmer uncovered 10–15 minutes to thicken. Taste and adjust seasoning.
- Mix the ricotta layer: In a bowl, combine ricotta, egg, chopped parsley or basil, a pinch of salt, and black pepper.
Stir until smooth.
- Assemble the lasagna: Lower oven to 375°F (190°C). Spread a thin layer of meat sauce in a 9×13-inch baking dish. Add a layer of zucchini slices, slightly overlapping.
Dollop and spread half the ricotta mixture over the zucchini. Sprinkle with one-third of the mozzarella and some Parmesan. Repeat layers: sauce, zucchini, ricotta, and cheeses.
- Top and bake: Finish with a final layer of zucchini, the remaining meat sauce, and the rest of the mozzarella and Parmesan.
Cover loosely with foil (tent it so cheese doesn’t stick) and bake 20 minutes.
- Uncover to brown: Remove foil and bake another 10–15 minutes until the cheese is bubbly and golden at the edges.
- Rest before slicing: Let the lasagna sit 10–15 minutes. This helps it set so slices hold together.
- Garnish and serve: Sprinkle with fresh basil or parsley. Cut into squares and serve warm.
How to Store
- Refrigerate: Cool completely, then store in an airtight container for up to 4 days.
- Freeze: Portion into freezer-safe containers.
Freeze for up to 2 months. For best texture, thaw overnight in the fridge.
- Reheat: Warm in a 350°F (175°C) oven, covered, for 15–20 minutes, or microwave individual slices in 60–90 second intervals. If excess moisture appears, blot gently with a paper towel before serving.
Health Benefits
- Low in carbs: Zucchini replaces traditional noodles, keeping net carbs in check while still feeling satisfying.
- High in protein: Ground beef and cheese help support satiety and muscle maintenance.
- Micronutrient boost: Zucchini offers vitamin C, potassium, and fiber, while tomatoes bring lycopene, an antioxidant.
- Better blood sugar control: Fewer refined carbs can help reduce blood sugar spikes compared to classic lasagna.
What Not to Do
- Don’t skip drying the zucchini: Salting and pre-baking prevent a watery, soupy result.
- Don’t over-sauce: Too much sauce adds moisture.
Keep layers thin and balanced.
- Don’t slice immediately: Cutting right out of the oven leads to messy portions. Rest the lasagna so it sets.
- Don’t use watery ricotta: If your ricotta is loose, drain it in a fine mesh strainer for 15 minutes before mixing.
- Don’t skip seasoning: Taste the sauce and ricotta layer. Proper seasoning is what makes the flavors pop.
Variations You Can Try
- White lasagna: Swap marinara for a garlicky Alfredo-style cream sauce (use heavy cream, Parmesan, butter).
Add sautéed spinach and mushrooms.
- Turkey or chicken: Use ground turkey or chicken instead of beef. Brown well and add extra Italian seasoning for depth.
- Vegetarian: Skip the meat and load up on sautéed mushrooms, spinach, and zucchini. Use a low-sugar marinara and boost protein with extra ricotta.
- Spicy sausage: Go all-in with hot Italian sausage for bold flavor.
Pair with a pinch more red pepper flakes.
- Pesto layer: Spread a thin layer of pesto over the ricotta for a fresh, herby twist. Use sparingly to keep carbs low.
- Dairy-light: Use part-skim mozzarella and ricotta. You can also reduce cheese slightly and add extra herbs for flavor.
FAQ
How do I keep keto lasagna from being watery?
Slice the zucchini thin, salt and rest it to draw out moisture, then pre-bake the slices.
Keep sauce layers thin and let the finished lasagna rest before slicing. These steps make a big difference.
Can I make this ahead?
Yes. Assemble the lasagna up to one day in advance, cover, and refrigerate.
Bake just before serving, adding 5–10 minutes to the initial covered bake time since it’s starting cold.
Do I need a mandoline to slice the zucchini?
No, but it helps with even, thin slices. A sharp chef’s knife works fine—aim for consistent thickness so the layers cook evenly and hold together.
What’s the best zucchini thickness?
About 1/8–1/6 inch. Too thin and slices can tear; too thick and they release more moisture and taste undercooked.
Can I use cottage cheese instead of ricotta?
Yes.
Choose full-fat cottage cheese and blend it briefly for a smoother texture. Drain it if it seems watery to avoid excess moisture in the casserole.
Which marinara is keto-friendly?
Look for sauces with no added sugar and around 4–6 grams of net carbs per half cup. If in doubt, use crushed tomatoes and season them yourself.
How many servings and carbs per serving?
In a 9×13-inch pan, you’ll get about 8 servings.
Exact carbs vary by sauce and cheese brands, but expect roughly 6–9 net carbs per serving when using low-sugar marinara.
Can I grill the zucchini instead of baking it?
Yes. A quick grill on medium-high heat adds a nice smoky flavor and removes moisture. Just don’t overcook the slices or they’ll fall apart during assembly.
What pan should I use?
A standard 9×13-inch baking dish works well.
If your dish is shallow, place it on a sheet pan to catch any potential drips.
How long will leftovers last?
Stored properly in the fridge, leftovers keep up to 4 days. For longer storage, freeze individual portions for up to 2 months.
Final Thoughts
Keto Lasagna with Zucchini Noodles proves you don’t have to give up comfort food to stick to your goals. With a few smart techniques, you’ll get all the layers, richness, and satisfaction of classic lasagna—minus the carb load.
Make it your own with sausage, herbs, or a veggie boost, and enjoy a cozy, crowd-pleasing dinner that fits your lifestyle.
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