Green Lentil Vegetable Casserole

Featured in: Weekend Warm-Bake Comforts

This satisfying one-dish meal brings together tender green lentils and a colorful medley of vegetables including onions, carrots, zucchini, bell peppers, mushrooms, and spinach. Seasoned with thyme, oregano, and smoked paprika, everything gets baked until golden and bubbly with a light Parmesan topping.

The dish comes together in just over an hour with simple preparation steps. Sauté the vegetables while the lentils simmer, then combine everything in a baking dish for the final oven phase. The result is a nutritious, filling main course that's perfect for meal prep or feeding a family.

Customize with whatever seasonal vegetables you have available—squash, sweet potatoes, or kale work beautifully. Serve alongside a fresh green salad and crusty bread for a complete, satisfying meal.

Updated on Tue, 27 Jan 2026 20:10:13 GMT
Golden-brown Green Lentil and Vegetable Casserole fresh from the oven, topped with melted Parmesan and fresh herbs. Pin It
Golden-brown Green Lentil and Vegetable Casserole fresh from the oven, topped with melted Parmesan and fresh herbs. | hazelflint.com

This Green Lentil and Vegetable Casserole is a hearty, comforting dish that perfectly combines protein-rich green lentils with a vibrant medley of seasonal vegetables. Baked until golden with aromatic herbs, it serves as a wholesome and satisfying main dish that is ideal for chilly evenings.

Golden-brown Green Lentil and Vegetable Casserole fresh from the oven, topped with melted Parmesan and fresh herbs. Pin It
Golden-brown Green Lentil and Vegetable Casserole fresh from the oven, topped with melted Parmesan and fresh herbs. | hazelflint.com

The combination of tender lentils and softened vegetables creates a wonderful texture, while the smoked paprika and dried herbs bring an earthy depth to the flavor profile. It is a nutritious meal that doesn't compromise on comfort.

Ingredients

  • Lentils: 1 cup (200 g) dried green lentils, rinsed; 3 cups (720 ml) vegetable broth.
  • Vegetables: 1 medium onion, diced; 2 cloves garlic, minced; 2 medium carrots, sliced; 1 medium zucchini, diced; 1 red bell pepper, diced; 1 cup (150 g) button mushrooms, sliced; 1 cup (150 g) cherry tomatoes, halved; 2 cups (60 g) fresh spinach, roughly chopped.
  • Herbs & Seasonings: 2 tbsp olive oil; 1 tsp dried thyme; 1 tsp dried oregano; 1/2 tsp smoked paprika; 1/2 tsp ground black pepper; 1/2 tsp salt (or to taste).
  • Topping: 1/3 cup (30 g) grated Parmesan cheese (or vegan alternative); 1/2 cup (40 g) gluten-free breadcrumbs (optional).
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Instructions

Step 1
Preheat the oven to 375°F (190°C).
Step 2
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 3
While lentils cook, heat olive oil in a large skillet over medium heat. Sauté onion and garlic for 2–3 minutes until fragrant.
Step 4
Add carrots, zucchini, bell pepper, and mushrooms. Cook, stirring occasionally, for 5–7 minutes until vegetables begin to soften.
Step 5
Stir in cherry tomatoes, spinach, thyme, oregano, smoked paprika, salt, and black pepper. Cook for another 2–3 minutes until spinach wilts.
Step 6
Combine cooked lentils and sautéed vegetables in a large mixing bowl. Mix well to combine.
Step 7
Transfer the mixture to a greased 2-quart (2-liter) baking dish. Sprinkle with Parmesan cheese and breadcrumbs (if using).
Step 8
Bake uncovered for 20–25 minutes, until the top is golden and the casserole is bubbling.
Step 9
Let rest for 5 minutes before serving.

Zusatztipps für die Zubereitung

To ensure the best results, use a 2-quart (2-liter) baking dish for the perfect depth. Utilizing a chef's knife for precise dicing ensures the vegetables cook evenly. Make sure to simmer the lentils just until tender to maintain a pleasant bite in the finished casserole.

Varianten und Anpassungen

For a fully vegan version, use a dairy-free Parmesan alternative or omit the cheese entirely. You can also easily swap in other seasonal vegetables you have on hand, such as squash, sweet potatoes, or kale, to suit your preferences.

Serviervorschläge

Serve this hearty dish with a simple green salad and crusty gluten-free bread for a complete meal. It also pairs wonderfully with a light red wine, such as a Pinot Noir, to complement the earthy tones of the lentils.

A vibrant serving of Green Lentil and Vegetable Casserole scooped onto a plate with a fresh side salad. Pin It
A vibrant serving of Green Lentil and Vegetable Casserole scooped onto a plate with a fresh side salad. | hazelflint.com

Enjoy this nutritious and fiber-rich meal that brings together the best of seasonal produce and pantry staples for a truly satisfying vegetarian dinner.

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Recipe FAQs

Can I make this casserole ahead of time?

Yes, assemble the entire dish up to 24 hours in advance and refrigerate before baking. Add 10-15 minutes to the baking time if cooking straight from the refrigerator. You can also freeze the assembled, unbaked casserole for up to 3 months.

Do I need to soak green lentils before cooking?

No soaking required for green lentils. Simply rinse them thoroughly and simmer in vegetable broth for 20-25 minutes until tender. Unlike dried beans, lentils cook relatively quickly and don't require pre-soaking.

What vegetables work best in this casserole?

Root vegetables like carrots, parsnips, and sweet potatoes hold up well during baking. Other excellent options include butternut squash, eggplant, kale, or Swiss chard. Aim for about 4-5 cups total vegetables, diced into similar-sized pieces for even cooking.

How do I store leftovers?

Store cooled leftovers in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave or cover the baking dish with foil and warm at 350°F (175°C) for 15-20 minutes. The flavors often improve after a day or two.

Can I use different types of lentils?

Green lentils work best because they hold their shape during baking. Brown lentils are a suitable substitute, though they may become slightly softer. Avoid red or yellow lentils as they tend to dissolve and become mushy in casseroles.

Is this suitable for meal prep?

Absolutely. This casserole freezes beautifully and portions easily. Divide into individual containers for grab-and-go lunches throughout the week. The texture remains satisfying after freezing and reheating, making it ideal for batch cooking.

Green Lentil Vegetable Casserole

Protein-rich lentils and vegetables baked with herbs for a wholesome, gluten-free main dish.

Prep Time
20 minutes
Cook Time
50 minutes
Overall Time
70 minutes
Recipe by Vivian Gray


Skill Level Easy

Cuisine International

Makes 4 Servings

Diet Preferences Vegetarian-Friendly

Ingredient List

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: Preheat the 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 20–25 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 2–3 minutes until fragrant.

Step 04

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

Step 05

Add finishing vegetables and seasonings: 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 ingredients: Combine cooked lentils and sautéed vegetables in a large mixing bowl. Mix well to combine.

Step 07

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

Step 08

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

Step 09

Rest before serving: Let rest for 5 minutes before serving.

Necessary Tools

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

Allergen Details

Review ingredients for allergens, and always talk to your doctor if you're unsure.
  • Contains milk from Parmesan cheese
  • May contain gluten in breadcrumbs

Nutrition Details (per portion)

Use this nutrition info as a reference only. It‘s not intended as healthcare advice.
  • Calories: 320
  • Fats: 8 g
  • Carbohydrates: 48 g
  • Proteins: 16 g