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Delicious Low-Carb Vegetarian Lasagna: My Tested Slow Cooker or Oven Recipe

I've nailed it—a mouthwatering vegetarian lasagna that's genuinely low-carb, skipping traditional pasta sheets, and tastes just as indulgent as the classic meat version. As a home cook passionate about sustainable, family-friendly meals, I've refined this recipe through trial and error for creamy layers and bold flavors.

Table of contents

Vegetarian Lasagna, Low-Carb

This recipe was born from a happy accident. I set out to create a meat-free lasagna to reduce our family's meat consumption—mindful of environmental impact—using vegetarian mince from The Vegetarian Butcher (their balls are a hit, so I trusted this too). Forgot the pasta sheets? Discovered pumpkin lasagna sheets instead, transforming it into a low-carb gem.

Ingredients for Lasagna Recipe Without Meat (Serves at Least 6)

Inspired by my prior slow cooker lasagna experiments (non-vegetarian), I adapted it here. The slow cooker excels for infused flavors and creaminess, but oven works great too. Curious about more slow cooker ideas? Explore my collection.

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  • 2 packets vegetarian mince from The Vegetarian Butcher
  • 1 pack pumpkin lasagna sheets
  • 3 red onions, chopped (I added leftover spring onions)
  • 1 pack sieved tomatoes (500 ml)
  • 1 small can tomato paste
  • 2 leeks
  • 2 bell peppers
  • 1 bowl mushrooms
  • Grated cheese
  • 4-5 garlic cloves, minced
  • 1 zucchini (optional)
  • 2 tbsp Italian seasoning
  • Salt or Maggi garden herb stock to taste

For even lower carbs, skip the béchamel—but it elevates the flavor, as in my standard lasagna recipe.

Ingredients for the Béchamel Sauce

  • 500 ml cold milk
  • 50 g flour (a few tablespoons)
  • 50 g butter
  • Stock powder to taste

Vegetarian Lasagna Preparation

  • Chop red onions, slice mushrooms and leeks into rings, dice zucchini and bell peppers, mince garlic.
  • Fry onions and garlic in oil in a wok.
  • Stir in tomato paste until fragrant.
  • Add mushrooms, leeks, peppers, zucchini, and vegetarian mince (pan will fill up).
  • Turn regularly, add Italian herbs and sieved tomatoes.
  • Prepare béchamel meanwhile.
  • Layer in slow cooker or oven dish as below.

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Slow Cooker Method

  • Grease slow cooker.
  • Layer: base sauce, pumpkin sheets,
  • béchamel, repeat.
  • Finish with base sauce and grated cheese.
  • Cook on low 4 hours. Note: Single pumpkin layer softens; double it next time for firmness.

Oven Method

Prep and layer as above in greased ovenproof dish. Preheat to 200°C, bake 40 minutes. Savor your low-carb vegetarian lasagna!

Why I Stick to Vegetarian Lasagna Now

We're intentionally cutting meat for health and planet—without sacrificing joy. We still enjoy meat occasionally, but stellar veggie options like this win out. For kid-friendly vegetarian recipes, check my colleague Judith's site.