Green Lentil and Vegetable Casserole

Featured in: Oven & Pan Classics

This satisfying casserole brings together tender green lentils and a colorful medley of vegetables including onions, carrots, zucchini, bell peppers, and mushrooms. The vegetables are sautéed with garlic and herbs like thyme, oregano, and smoked paprika before being combined with the lentils and baked until golden.

The dish features a crispy topping of Parmesan cheese and optional breadcrumbs, creating a wonderful texture contrast. It's naturally vegetarian and easily made vegan with dairy-free cheese substitutes.

Perfect for meal prep, this casserole serves four and keeps well in the refrigerator for several days. The high fiber and protein content make it a filling main course that pairs beautifully with a simple green salad and crusty bread.

Updated on Wed, 28 Jan 2026 13:50:00 GMT
Freshly baked Green Lentil and Vegetable Casserole with golden Parmesan and breadcrumb topping, served hot from the oven. Save
Freshly baked Green Lentil and Vegetable Casserole with golden Parmesan and breadcrumb topping, served hot from the oven. | maisonflavors.com

The steam from a simmering pot of lentils always reminds me of a rainy Tuesday in late November. I was trying to clear out the crisper drawer before the local market opened the next day. This dish happened by accident, a colorful heap of whatever was left in the fridge. It turned out to be the most comforting meal I had made all year. Now, it is my favorite way to transition into the colder months.

I once made this for a friend who claimed they hated lentils. We sat on the floor of my tiny apartment, eating straight from the baking dish. By the time we reached the crispy edges, they were asking for the recipe. It proved that hearty food does not need meat to feel like a full embrace.

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Ingredients

  • Dried green lentils: These hold their shape much better than red ones during the long baking process.
  • Vegetable broth: I prefer using a low sodium version so I can control the saltiness myself.
  • Aromatic onion and garlic: These form the flavor foundation that makes the whole house smell like a professional kitchen.
  • Colorful vegetable medley: Mixing zucchini, carrots, and peppers adds various textures that keep every bite interesting.
  • Fresh spinach: Folding this in at the last second adds a pop of bright green and extra nutrients.
  • Smoked paprika: This is the secret ingredient that provides a deep, slightly campfire flavor to the legumes.
  • Parmesan and breadcrumbs: This duo creates a salty, crunchy crust that balances the soft vegetables perfectly.

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Instructions

Boiling the base:
Simmer the lentils in broth until they are tender but still have a slight bite to them. You will know they are ready when they have absorbed most of the liquid.
Softening the aromatics:
Saute the onion and garlic in oil until they turn translucent and smell sweet. This creates a savory base that carries through the entire dish.
Building the texture:
Toss in the carrots, zucchini, and peppers, letting them brown just enough to develop flavor. The colors should look vibrant against the pan.
The green wilt:
Stir in the spinach and tomatoes at the very end so they soften without turning into mush. The spinach will shrink down almost instantly.
The final assembly:
Fold everything together in a large bowl before spreading it into your greased baking dish. Make sure the lentils and vegetables are evenly distributed.
The golden finish:
Bake it until the cheese bubbles and the breadcrumbs reach a beautiful toasted brown color. Let it rest for a moment so the juices can settle.
Savory Green Lentil and Vegetable Casserole paired with a crisp green salad and crusty gluten-free bread. Save
Savory Green Lentil and Vegetable Casserole paired with a crisp green salad and crusty gluten-free bread. | maisonflavors.com

One evening, I accidentally used a spicy smoked paprika instead of the sweet kind. My family spent the whole dinner reaching for extra glasses of water, but nobody stopped eating. That little mistake taught me how much a single spice can transform the personality of a dish.

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The Seasonal Shift

I find that this recipe evolves with the calendar. In the spring, I might swap the carrots for asparagus or peas to keep it light. The earthy lentils serve as a blank canvas for whatever the earth is providing at the moment.

Choosing Your Texture

The topping is where you can really express your mood for the day. Sometimes I go heavy on the cheese for a gooey finish, while other times I prefer the sharp crunch of extra breadcrumbs. If I am feeling adventurous, I might even crush up some walnuts for an extra layer of earthiness. The contrast between the soft interior and the crisp top is what makes this a standout.

Making It Your Own

This casserole is incredibly forgiving if you are missing an ingredient or two. You can substitute kale for spinach if you want a bit more chew in your greens. Just remember to taste as you go to ensure the herbs are shining through.

  • Try adding a splash of lemon juice at the end for a bright acidity.
  • Swap the parmesan for nutritional yeast if you want to keep it strictly vegan.
  • Add a handful of fresh parsley before serving to give it a fresh finish.
Steam rises from a hearty serving of Green Lentil and Vegetable Casserole, highlighting colorful carrots, zucchini, and tomatoes. Save
Steam rises from a hearty serving of Green Lentil and Vegetable Casserole, highlighting colorful carrots, zucchini, and tomatoes. | maisonflavors.com

I hope this hearty bake brings as much warmth to your table as it has to mine. It is more than a meal, it is a reminder that simple ingredients can create the most lasting memories.

Questions & Answers for Recipes

Can I make this casserole ahead of time?

Yes, you can assemble the entire casserole up to 24 hours in advance and refrigerate it before baking. You may need to add 5-10 minutes to the baking time if baking cold. It also reheats beautifully for leftovers throughout the week.

What other vegetables work well in this dish?

Feel free to customize with seasonal vegetables like butternut squash, sweet potatoes, eggplant, kale, or Swiss chard. The key is to cut vegetables into similar-sized pieces so they cook evenly. Root vegetables may need slightly longer cooking time.

Do I need to soak the green lentils before cooking?

No, green lentils don't require soaking unlike dried beans. Simply rinse them thoroughly and simmer in vegetable broth for 20-25 minutes until tender. Avoid overcooking or they'll become mushy and lose their texture in the casserole.

How can I make this casserole vegan?

Simply substitute the Parmesan cheese with a vegan alternative or nutritional yeast, and ensure your breadcrumbs are gluten-free and vegan-friendly. The result is still delicious and satisfying with a protein-rich, plant-based focus.

Can I freeze this casserole?

Yes, this freezes well either before or after baking. If freezing before baking, thaw overnight in the refrigerator before baking as directed. For leftovers, wrap individual portions tightly and freeze for up to 3 months. Reheat in a 350°F oven until warmed through.

What can I serve with this lentil casserole?

A crisp green salad with vinaigrette complements the heartiness of the casserole. Crusty gluten-free bread or roasted potatoes also make excellent sides. For a complete meal, consider serving with steamed green beans or roasted broccoli.

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Green Lentil and Vegetable Casserole

Protein-rich green lentils paired with seasonal vegetables in a comforting baked casserole with aromatic herbs and golden cheesy topping.

Prep Time
20 mins
Time for Cooking
50 mins
Overall Time Needed
70 mins
Created by Lindsey Brooks


Skill Level Easy

Cuisine International

Servings Produced 4 Portions

Diet Preferences Meat-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 1/2 teaspoon smoked paprika
05 1/2 teaspoon ground black pepper
06 1/2 teaspoon salt

Topping

01 1/3 cup grated Parmesan cheese or vegan alternative
02 1/2 cup gluten-free breadcrumbs, optional

Directions

Step 01

Preheat oven: Set oven to 375°F and allow it to reach full temperature.

Step 02

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

Step 03

Sauté aromatics: Heat olive oil in a large skillet over medium heat. Sauté onion and garlic for 2-3 minutes until fragrant.

Step 04

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

Step 05

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

Step 06

Combine components: Transfer cooked lentils and sautéed vegetables to a large mixing bowl. Mix well to thoroughly combine.

Step 07

Transfer to baking dish: Pour the lentil and vegetable mixture into a greased 2-quart baking dish. Sprinkle with Parmesan cheese and breadcrumbs if using.

Step 08

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

Step 09

Rest before serving: Remove from oven and let rest for 5 minutes before serving.

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Equipment Needed

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

Allergy Info

Please check every ingredient for allergens and reach out to a healthcare pro if unsure.
  • Contains milk from Parmesan cheese
  • May contain gluten in breadcrumbs unless labeled gluten-free
  • Always verify ingredient labels for potential allergens

Nutrition Details (each serving)

These numbers are estimates for reference and not a replacement for health advice.
  • Energy: 320
  • Fats: 8 g
  • Carbohydrates: 48 g
  • Proteins: 16 g

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