Baked Lentil Casserole
A hearty, wholesome casserole loaded with tender lentils, vegetables, and a savory tomato sauce baked together until bubbling and golden. It's the kind of comforting dish that makes the whole house smell amazing and tastes even better the next day. Perfect for a cozy weeknight dinner.
For 4 servings
- prep
Preheat the oven and prepare the baking dish.
Preheat oven to 375°F (190°C). Lightly grease an 8-inch square baking dish with a little olive oil.
- boil · ~18 min
Cook the lentils.
1.Combine 1.5 cups rinsed brown lentils and 3 cups water in a medium saucepan.2.Bring to a boil over high heat, then reduce to a simmer.3.Cook until lentils are just tender but still hold their shape, about 15-18 minutes.4.Drain any excess liquid and set aside.TIPDon't overcook the lentils — they will continue cooking in the oven. Slightly firm is perfect. - saute · ~8 min
Sauté the vegetables.
1.Heat 2 tbsp olive oil in a large skillet over medium heat.2.Add the diced onion, carrot, and celery. Cook until softened, about 6-7 minutes.3.Add the minced garlic and cook until fragrant, about 1 minute more.TIPSauté the vegetables until they start to release their sweetness — this builds the deep, savory flavor of the casserole. - mix · ~5 min
Combine the casserole filling.
1.Stir in the diced tomatoes, tomato paste, and 1 cup water into the skillet with the sautéed vegetables.2.Add the dried thyme, dried oregano, smoked paprika, salt, and black pepper.3.Fold in the cooked lentils gently until everything is evenly mixed.4.Bring the mixture to a gentle simmer for 2-3 minutes so the flavors meld. - assemble
Assemble the casserole.
Pour the lentil mixture into the prepared baking dish and spread it into an even layer. Sprinkle the bread crumbs evenly over the top to create a thin, golden crust.
- bake · ~30 min
Bake the casserole until bubbly and golden.
Place the dish in the preheated oven. Bake for 25-30 minutes, until the top is golden brown and the edges are bubbling.
TIPIf the bread crumbs are browning too quickly, cover loosely with foil for the last 10 minutes. - rest · ~10 min
Let it rest before serving.
Remove from the oven and let the casserole sit for 5-10 minutes. This helps it set for cleaner serving.
- garnish
Garnish with fresh parsley and serve hot.
Scatter the fresh chopped parsley over the top and bring the dish to the table.
What to keep in mind.
6 tips from the recipe — small details that make a real difference to the final dish.
- 1Sauté the mirepoix until the onions turn translucent to build a deep savory base.
- 2Cook the lentils until al dente — they will soften further during baking.
- 3Let the casserole rest for 5–10 minutes after baking so it sets and slices cleanly.
- 4For a crisper topping, toss bread crumbs with a drizzle of olive oil before sprinkling.
- 5Make ahead: assemble the casserole (without topping), refrigerate, then add crumbs and bake.
- 6Store leftovers in an airtight container in the fridge for up to 4 days — the flavor deepens.
Adapt it for your goals.
High-protein
Add 8 ounces of crumbled cooked sausage or diced chicken breast after sautéing the vegetables for extra protein and a heartier meal.
veganVegan
Use olive oil instead of butter. This recipe is already vegan, so simply ensure your bread crumbs are vegan-friendly.
low calorieLow-calorie
Replace the bread crumbs with a mixture of whole-wheat panko and a splash of olive oil spray to reduce calories while keeping a crunchy top.
gluten freeGluten-free
Swap the bread crumbs for crushed gluten-free crackers or almond flour mixed with a little nutritional yeast for a savory, crispy topping.
Why this is on our healthy list.
High in Plant Protein
Brown lentils are a rich source of plant-based protein, making this casserole a satisfying main dish that supports muscle maintenance and fullness.
Rich in Dietary Fiber
Lentils, carrots, and celery provide ample fiber, which aids digestion and helps maintain steady blood sugar levels.
Packed with Vitamins
Carrots deliver beta-carotene (vitamin A) and the tomatoes provide vitamin C and lycopene, an antioxidant linked to heart health.
Low in Saturated Fat
With only olive oil as added fat, this casserole is naturally low in saturated fat, supporting heart-healthy eating patterns.
Frequently asked questions
Green lentils are a good substitute (cook about 20 minutes). Avoid red lentils as they break down too quickly and will turn mushy.
