Keto Lasagna Recipe: Layered, Cheesy, and Ready Without a Single Sheet of Pasta

How do you make keto lasagna without pasta? You replace the pasta sheets with thin slices of zucchini or with fathead dough sheets — then layer them with a rich beef and tomato ragù, creamy béchamel made from cream and cream cheese, and generous amounts of melted mozzarella. The result is a deeply satisfying, sliceable keto lasagna at approximately 9g net carbs per portion that holds its shape when cut and eats like the real thing.

Keto lasagna is one of the most rewarding projects in low-carb cooking. It takes time — this is not a 20-minute weeknight dish — but it batch-cooks brilliantly, freezes perfectly, and produces enough for 6–8 servings that reheat beautifully all week. Make it on a Sunday and eat like royalty until Friday.

The Best Keto Pasta Replacement for Lasagna

Zucchini sheets are the most popular choice — they’re easy to prepare, hold up to the weight of the filling, and contribute under 3g net carbs per layer. The key is salting and grilling the zucchini slices before layering to remove moisture and prevent a watery final dish. Fathead dough sheets are the second option — slightly more effort to make but closer to the texture of real pasta and preferred by those who find zucchini too soft.

Ingredients You Will Need

Zucchini Sheets

• 4 large zucchini, sliced lengthways into 3–4mm sheets (use a mandoline or sharp knife)
• Salt for drawing out moisture

Beef Ragù

• 600g (1.3 lb) minced beef
• 1 medium onion, finely diced
• 3 cloves garlic, minced
• 400g (14 oz) crushed tomatoes
• 2 tablespoons tomato paste
• 1 teaspoon dried oregano + 1 tsp dried basil
• Salt, pepper, and a pinch of chilli flakes
• 2 tablespoons olive oil

Keto Béchamel

• 200ml (¾ cup) heavy cream
• 100g (3.5 oz) cream cheese
• 50g (1.75 oz) parmesan, finely grated
• 1 egg yolk
• Pinch of nutmeg, salt and white pepper

Assembly

• 200g (7 oz) mozzarella, shredded
• Extra parmesan for the top

How to Make Keto Lasagna: Step-by-Step

1. Prep zucchini sheets: Lay slices on paper towels, salt generously, leave 15 minutes. Pat completely dry. Grill or griddle pan each slice for 2 minutes per side until slightly charred and most moisture is gone. Set aside.
2. Make the ragù: Brown minced beef in olive oil over high heat until well coloured. Add onion and cook 5 minutes. Add garlic, tomato paste, and spices — cook 1 minute. Add crushed tomatoes, simmer 20 minutes uncovered until thick. Season and set aside.
3. Make the béchamel: Warm heavy cream in a small saucepan. Add cream cheese and whisk until smooth. Stir in parmesan, nutmeg, salt, and white pepper. Remove from heat, whisk in egg yolk quickly. The sauce should coat a spoon.
4. Preheat oven to 190°C (375°F).
5. Assemble: In a deep baking dish, start with a thin layer of ragù. Add a layer of zucchini sheets. Add ragù, béchamel, and a scatter of mozzarella. Repeat layers — finishing with béchamel and a generous layer of mozzarella and parmesan on top.
6. Bake: Cover with foil and bake 25 minutes. Remove foil and bake a further 15–20 minutes until the top is deep golden and bubbling at the edges.
7. Rest 15 minutes before cutting. This is the step most people skip — resting allows the layers to firm up so the lasagna holds its shape when sliced rather than collapsing.

Critical Tips

• Grill the zucchini sheets before layering. Ungrilled zucchini releases water into the lasagna as it bakes, making the whole dish soupy and preventing the layers from holding shape.
• Make a thick ragù. Simmer the sauce uncovered until it’s genuinely thick — almost paste-like. Watery ragù makes a watery lasagna.
• Rest before cutting. 15 minutes minimum. The difference between a lasagna that holds its shape and one that collapses into a delicious but embarrassing heap is entirely in the resting time.

Frequently Asked Questions

What is the best pasta substitute for keto lasagna? Grilled zucchini sheets are the most accessible — slice thin, salt, dry, and grill before layering. Fathead dough sheets are closer to real pasta in texture. Cabbage leaves are a third option — blanch briefly and pat dry before using.

Can I freeze keto lasagna? Yes — freeze in individual portion-sized pieces after fully cooling. Reheat from frozen at 180°C for 25–30 minutes covered with foil.

Key Takeaways

• Grill zucchini sheets before layering — moisture removal is essential.
• Make the ragù genuinely thick — simmer uncovered.
• Rest 15 minutes before cutting — non-negotiable for clean slices.
• Approximately 9g net carbs per portion.
• Freezes perfectly — make a double batch and freeze half.

Keto lasagna is worth the effort — a Sunday cooking project that feeds you brilliantly for the whole week. Make it once properly and you’ll understand why it’s in the permanent rotation of every serious keto household.

Nutrition Per Serving (Approximate — 6 servings)

Calories: ~520 | Protein: ~38g | Net Carbs: ~9g | Fat: ~38g