One-Pan Smoky Veggie Lentil Lasagne (Printable)

Hearty vegetarian lasagne with smoky lentils, mushrooms, and rich béchamel sauce, all baked in one pan for easy cleanup.

# What You'll Need:

→ Vegetable Bolognese

01 - 2 tablespoons olive oil
02 - 1 large onion, finely chopped
03 - 2 garlic cloves, minced
04 - 1 medium carrot, diced
05 - 1 red bell pepper, diced
06 - 8.8 ounces mushrooms, chopped
07 - 2 medium zucchini, diced
08 - 1 teaspoon smoked paprika
09 - 1 teaspoon dried oregano
10 - 1/2 teaspoon dried thyme
11 - 1/2 teaspoon chili flakes
12 - 1 tablespoon tomato paste
13 - 14 ounces canned chopped tomatoes
14 - 1 tablespoon soy sauce
15 - 4.4 ounces dried red lentils, rinsed
16 - 2 cups vegetable stock
17 - Salt and black pepper to taste

→ Béchamel Sauce

18 - 3 tablespoons unsalted butter
19 - 1.4 ounces all-purpose flour
20 - 2.5 cups whole milk
21 - 1/4 teaspoon ground nutmeg
22 - 2.1 ounces grated mature cheddar or vegetarian hard cheese
23 - Salt and white pepper to taste

→ Assembly

24 - 9 to 12 no-boil lasagne sheets
25 - 1.8 ounces grated mozzarella or vegetarian cheese for topping
26 - Fresh basil leaves for garnish

# Directions:

01 - Preheat oven to 400°F with a standard rack positioned in the center.
02 - Heat olive oil in a large ovenproof deep skillet over medium heat. Add chopped onion and minced garlic, sautéing for 2 minutes until fragrant and softened.
03 - Add diced carrot, red bell pepper, mushrooms, and zucchini to the pan. Cook for 5 to 6 minutes, stirring occasionally, until vegetables are softened and beginning to release their moisture.
04 - Stir in smoked paprika, dried oregano, dried thyme, chili flakes, and tomato paste. Cook for 1 minute, stirring constantly, until the spices are fully incorporated and fragrant.
05 - Add canned tomatoes, soy sauce, rinsed red lentils, and vegetable stock. Bring to a gentle simmer, partially cover with a lid, and cook for 15 to 20 minutes, stirring occasionally. The mixture should thicken and lentils should become tender. Season with salt and black pepper to taste.
06 - In a separate medium saucepan, melt butter over medium heat. Add flour and cook for 1 minute, stirring constantly, to create a roux. Gradually whisk in milk while stirring to prevent lumps. Continue cooking and stirring for approximately 5 minutes until the sauce thickens and coats the back of a spoon. Remove from heat and stir in ground nutmeg and grated cheese. Season with salt and white pepper.
07 - Remove half of the vegetable bolognese from the pan and set aside in a bowl. Spread one-third of the béchamel sauce over the remaining bolognese in the ovenproof pan. Top with a single layer of lasagne sheets, breaking them to fit snugly in the pan.
08 - Spread half of the reserved bolognese over the lasagne sheets. Pour another third of the béchamel sauce over this layer. Top with another layer of lasagne sheets, adjusting to fit the pan dimensions.
09 - Spread the remaining bolognese mixture over the second pasta layer. Top with the final layer of lasagne sheets. Pour the remaining béchamel sauce evenly over the top, ensuring complete coverage. Sprinkle the grated mozzarella or vegetarian cheese over the entire surface.
10 - Cover the pan loosely with aluminum foil to prevent excessive browning. Bake in the preheated oven for 25 minutes.
11 - Carefully remove the foil from the pan. Continue baking, uncovered, for 10 to 15 minutes until the top is golden brown and the sauce is bubbling around the edges.
12 - Remove the pan from the oven and allow the lasagne to rest undisturbed for 10 minutes. This resting period allows the layers to set and makes portioning cleaner. Garnish with fresh basil leaves if desired before serving.

# Expert Tips:

01 -
  • One pan means one thing to wash, which honestly changes everything when you're tired after work.
  • The smoky paprika transforms humble lentils and mushrooms into something that tastes like it took hours, not an hour.
  • It's naturally vegetarian but nobody notices because the umami from the soy sauce and cheese is doing all the heavy lifting.
02 -
  • Don't skip the smoked paprika or swap it for regular paprika—the whole dish's personality depends on that smokiness.
  • Whisk the milk into your roux slowly and patiently; rushing it creates lumps that won't disappear no matter how hard you stir.
  • The no-boil lasagne sheets need moisture from the surrounding sauces to soften properly, so make sure both your bolognese and béchamel are flavorful enough to carry the dish.
03 -
  • Taste and season the bolognese sauce before you layer it—this is your only chance to adjust the flavor, so be generous with salt and pepper.
  • Let your béchamel cool for just a minute before pouring it over the hot pasta layers; this helps it set properly without sliding around.
  • If your pan is particularly deep, use 12 lasagne sheets; if it's shallower, 9 sheets might be enough—adjust based on how many layers you need to reach near the top.
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