Green Lentil and Vegetable Casserole

Featured in: Everyday Home Meals

This satisfying casserole brings together tender green lentils and a colorful array of vegetables including onions, carrots, zucchini, bell peppers, mushrooms, cherry tomatoes, and fresh spinach. Seasoned with thyme, oregano, and smoked paprika, the mixture bakes until bubbly with a golden parmesan and breadcrumb crust. Ready in just over an hour, this gluten-free dish serves four and adapts easily to vegan preferences.

Updated on Wed, 28 Jan 2026 13:21:00 GMT
A hearty, baked Green Lentil and Vegetable Casserole served bubbling from the oven in a white dish.  Pin It
A hearty, baked Green Lentil and Vegetable Casserole served bubbling from the oven in a white dish. | tongsoffset.com

The aroma of lentils simmering on the stove always takes me back to that drizzly autumn Sunday when I first created this casserole. My farmers market haul was threatening to wilt in the fridge, and something hearty yet healthy seemed the perfect solution. As rain tapped against the kitchen window, I experimented with whatever vegetables needed using up, discovering that green lentils created the perfect foundation for their vibrant flavors. The resulting casserole was so much greater than the sum of its humble parts.

Last winter, I brought this casserole to a potluck dinner where dietary restrictions were causing the host considerable stress. The table held an assortment of dishes with little cards noting gluten-free, vegan, and various allergen warnings. My casserole disappeared first, with several guests asking for the recipe, not because they needed to accommodate restrictions but because the flavors spoke for themselves. Even my brother-in-law, a devoted carnivore, went back for seconds before asking what was in it.

Ingredients

  • Green lentils: The foundation of this dish, they maintain their shape when cooked properly, providing that wonderful texture that makes this casserole substantial without being heavy.
  • Vegetable broth: I once used water instead and deeply regretted it, as the broth infuses the lentils with flavor from the very beginning.
  • Seasonal vegetables: The rainbow of carrots, zucchini, bell peppers, mushrooms, tomatoes and spinach not only makes this visually stunning but provides layers of complementary flavors and textures.
  • Smoked paprika: This unassuming spice is actually the secret weapon, adding a subtle smokiness that makes people wonder why your vegetarian cooking tastes so satisfying.
  • Parmesan cheese: That golden, slightly crispy topping creates textural contrast with the tender vegetables beneath, though a good vegan alternative works beautifully too.

Instructions

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Prepare the lentils:
Combine the green lentils with vegetable broth in a saucepan and bring to a gentle boil before reducing to a simmer. Youll want to check them at about 20 minutes for that perfect tender but not mushy texture.
Sauté the aromatics:
Heat your olive oil until it shimmers, then add the onions and garlic, stirring until that wonderful fragrance fills your kitchen. This flavor foundation makes all the difference.
Add the vegetables:
Introduce the carrots, zucchini, bell pepper and mushrooms to the pan, letting them mingle and soften slightly. Youll know theyre ready when their colors brighten and they still have a bit of bite.
Incorporate the final fresh elements:
Gently fold in the cherry tomatoes and spinach along with the herbs and spices, watching as the spinach wilts into the mixture. The tomatoes should just begin to release their juices.
Combine everything:
Mix the cooked lentils with your sautéed vegetable medley, ensuring everything is evenly distributed. This is when the whole kitchen fills with the most appetizing aromas.
Bake to perfection:
Transfer the mixture to your baking dish, sprinkle with the cheese and breadcrumbs, then bake until golden and bubbling. The anticipation during this final cooking stage is almost unbearable.
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Keeps spices within easy reach while cooking, helping you season dishes quickly during everyday meal prep.
Check price on Amazon
Close-up of the Green Lentil and Vegetable Casserole highlighting golden cheese, fresh spinach, and tender vegetables.  Pin It
Close-up of the Green Lentil and Vegetable Casserole highlighting golden cheese, fresh spinach, and tender vegetables. | tongsoffset.com

One particularly memorable evening, a neighbor stopped by just as I was pulling this casserole from the oven. What began as a quick hello turned into an impromptu dinner as the inviting aroma drew her in. We ended up sharing the meal over a bottle of wine she ran home to fetch, proving once again that food has this magical way of creating connection. By the end of the evening, we had planned a neighborhood potluck centered around comfort food with global influences.

Serving Suggestions

The versatility of this casserole continues to surprise me with each serving. While perfectly satisfying on its own, I discovered it makes an exceptional side to a simple protein for those who insist on meat at every meal. My husband particularly enjoys it alongside a small piece of grilled fish, while I prefer it with nothing more than a crisp green salad dressed with lemon vinaigrette to cut through the richness.

Storage and Reheating

Perhaps the most wonderful quality of this casserole is how it improves with time. The flavors meld and deepen overnight in the refrigerator, making next-day portions something to look forward to rather than merely leftovers. I often make a double batch specifically to ensure we have plenty for quick lunches throughout the busy week ahead.

Adaptations and Variations

This recipe has evolved countless times in my kitchen depending on season and circumstance. During summer months, I add fresh corn cut straight from the cob and basil from my windowsill garden. Winter versions might include butternut squash and hearty kale in place of the zucchini and spinach.

  • For a protein boost, add a cup of cooked quinoa to the mixture before baking.
  • A sprinkle of toasted pine nuts or pumpkin seeds adds delightful crunch to contrast the tender vegetables.
  • For special occasions, a drizzle of truffle oil just before serving elevates this humble casserole to dinner party status.
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Ideal for slow-simmered sauces, braised vegetables, baked dips, and cozy one-pot meals with even heat.
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Colorful Green Lentil and Vegetable Casserole ready to serve, garnished with herbs and paired with a rustic salad. Pin It
Colorful Green Lentil and Vegetable Casserole ready to serve, garnished with herbs and paired with a rustic salad. | tongsoffset.com

This green lentil and vegetable casserole has become more than just a recipe in my collection, its a reminder that nourishing food need not be complicated or expensive to be deeply satisfying. Every time I prepare it, Im grateful for the simple abundance of vegetables and the humble lentil that together create something truly special.

Recipe FAQs

Can I make this casserole ahead of time?

Yes, assemble the casserole up to 24 hours in advance and refrigerate. Add 10-15 minutes to the baking time if baking cold from the refrigerator.

What vegetables work best in this dish?

The recipe suggests carrots, zucchini, bell peppers, and mushrooms, but you can easily substitute seasonal vegetables like squash, sweet potatoes, eggplant, or kale based on availability.

How do I make this vegan?

Simply replace the Parmesan cheese with a vegan alternative or nutritional yeast, and ensure your breadcrumbs are certified gluten-free if needed.

Can I use canned or pre-cooked lentils?

Yes, use about 2 cans (15 oz each) of rinsed lentils or 3 cups of pre-cooked lentils. Skip the simmering step and proceed with sautéing the vegetables.

What should I serve with this casserole?

A simple green salad and crusty gluten-free bread complement this dish perfectly. It also pairs beautifully with a light red wine like Pinot Noir.

How long do leftovers keep?

Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in the oven at 350°F until warmed through.

Green Lentil and Vegetable Casserole

Protein-rich lentils baked with seasonal vegetables, herbs, and parmesan topping for a wholesome main dish.

Prep Time
20 minutes
Cook Time
50 minutes
Overall Time
70 minutes
Recipe by Charlotte King


Skill Level Easy

Cuisine Type International

Serving Size 4 Portions

Diet Preferences Meat-Free, Gluten-Free

What You'll Need

Lentils

01 1 cup dried green lentils, rinsed
02 3 cups vegetable broth

Vegetables

01 1 medium onion, diced
02 2 cloves garlic, minced
03 2 medium carrots, sliced
04 1 medium zucchini, diced
05 1 red bell pepper, diced
06 1 cup button mushrooms, sliced
07 1 cup cherry tomatoes, halved
08 2 cups fresh spinach, roughly chopped

Herbs & Seasonings

01 2 tablespoons olive oil
02 1 teaspoon dried thyme
03 1 teaspoon dried oregano
04 0.5 teaspoon smoked paprika
05 0.5 teaspoon ground black pepper
06 0.5 teaspoon salt

Topping

01 0.33 cup grated Parmesan cheese or vegan alternative
02 0.5 cup gluten-free breadcrumbs

How to Make It

Step 01

Preheat Oven: Preheat oven to 375°F.

Step 02

Cook Lentils: In a medium saucepan, combine lentils and vegetable broth. Bring to a boil, reduce heat, and simmer uncovered for 20 to 25 minutes until lentils are tender but not mushy. Drain any excess liquid.

Step 03

Sauté Aromatics: While lentils cook, heat olive oil in a large skillet over medium heat. Sauté onion and garlic for 2 to 3 minutes until fragrant.

Step 04

Cook Root Vegetables: Add carrots, zucchini, bell pepper, and mushrooms. Cook, stirring occasionally, for 5 to 7 minutes until vegetables begin to soften.

Step 05

Finish Vegetable Mixture: Stir in cherry tomatoes, spinach, thyme, oregano, smoked paprika, salt, and black pepper. Cook for another 2 to 3 minutes until spinach wilts.

Step 06

Combine Ingredients: Transfer cooked lentils to a large mixing bowl with sautéed vegetables. Mix well to combine.

Step 07

Assemble Casserole: Transfer the mixture to a greased 2-quart baking dish. Sprinkle with Parmesan cheese and breadcrumbs.

Step 08

Bake: Bake uncovered for 20 to 25 minutes, until the top is golden and the casserole is bubbling.

Step 09

Rest: Let rest for 5 minutes before serving.

Gear Needed

  • Medium saucepan
  • Large skillet
  • Mixing bowl
  • 2-quart baking dish
  • Chef's knife
  • Cutting board

Allergy Info

Always double-check for allergens in each item and talk to a healthcare expert if unsure.
  • Contains milk from Parmesan cheese
  • May contain gluten in breadcrumbs

Nutrition Details (per portion)

These details are only for reference and not a substitute for actual professional advice.
  • Caloric Value: 320
  • Fats: 8 g
  • Carbohydrates: 48 g
  • Proteins: 16 g