Cozy Lentil Shepherds Pie with French Onion Twist – A Vegan Comfort Classic

Ever have one of those evenings where you’re tired, a little moody, and all you want is something warm, rich, and deeply comforting?

That’s me, especially on rainy nights or when the week’s been long.

This lentil shepherds pie is exactly what I turn to. It’s cozy, nostalgic, and somehow feels like a warm hug in a casserole dish. Think slow-cooked French onion soup meets creamy mashed potatoes—with a hearty lentil base that’ll make you forget it’s entirely plant-based.

A Little Backstory

I first made this lentil shepherds pie on a quiet Sunday when all I had were pantry basics and a craving for something that tasted like it took hours—without actually taking hours.

I had lentils. I had onions. I had potatoes that needed love. And I had zero desire to cook multiple dishes or fuss with complicated steps.

So, I slow-cooked those onions until they turned golden and sweet. Stirred in some garlic, broth, and tomato paste. Layered it under fluffy mashed potatoes. Baked until golden.

And just like that—I found a new favorite.

Why You’ll Love This Recipe

Everything cooks in layers, but it’s still easy to put together
It’s hearty and filling without being heavy
You don’t need fancy ingredients—just a few good basics
It tastes like traditional comfort food, but with a healthy twist

Even meat-lovers have gone back for seconds. And honestly, I think that says everything.

The Recipe: Lentil & French Onion Shepherd’s Pie

This recipe checks all the boxes: budget-friendly, nourishing, and packed with flavor. Perfect for cozy nights in or impressing friends at a plant-based dinner.

Ingredients

For the lentil & onion filling:

3 large yellow onions, thinly sliced
3 tablespoons olive oil
3 cloves garlic, minced
1 tablespoon fresh thyme (or 1 tsp dried)
2 tablespoons balsamic vinegar
2 tablespoons tomato paste
1 teaspoon soy sauce or tamari
1 cup cooked green or brown lentils (or 1/2 cup dried)
1 1/2 cups vegetable broth
Salt and pepper to taste

For the mashed potato topping:

4 large russet potatoes, peeled and chopped
3 tablespoons plant-based butter or olive oil
1/2 cup unsweetened plant-based milk
Salt and pepper to taste

Optional: A sprinkle of nutritional yeast, garlic powder, or a dash of smoked paprika in the mash for extra flavor.

Instructions

Step 1: Caramelize the onions
In a large skillet, heat the olive oil over medium heat. Add onions and a generous pinch of salt. Stir often. Let them cook low and slow—about 25 to 30 minutes—until they’re soft, golden, and sweet.

Step 2: Build the lentil filling
Add garlic, thyme, and tomato paste. Stir until everything smells amazing. Pour in the balsamic vinegar to deglaze the pan. Add lentils, broth, and soy sauce. Simmer for 10–12 minutes until thick and saucy. Taste and adjust seasoning.

Step 3: Make the mashed potatoes
Boil the chopped potatoes in salted water for 15–20 minutes or until fork-tender. Drain and mash with plant-based butter and milk. Season well. Keep the mash smooth but not runny.

Step 4: Assemble & bake
Preheat your oven to 375°F (190°C). Pour the lentil filling into a baking dish. Spread the mashed potatoes on top and use a fork to create little ridges.

Bake for 25 minutes. Broil for 2–3 minutes at the end if you like a crispy top.

Tips & Tricks

Add a splash of red wine while caramelizing onions for extra depth
No lentils on hand? Use mushrooms or plant-based crumbles
Add frozen peas or carrots to the lentils for extra texture
Great for meal prep—make it a day ahead and reheat
Leftover mashed potatoes work perfectly here

Frequently Asked Questions

Can I freeze lentil shepherds pie?
Yes! Let it cool completely, cover, and freeze. Reheat in the oven at 350°F until warmed through.

Can I make it oil-free?
Absolutely. Sauté onions in a bit of veggie broth instead of oil, and use more plant milk in the mash.

Which lentils are best for shepherd’s pie?
Brown or green lentils hold their shape and give a nice bite. Red lentils will get too soft and mushy.

Bringing It Home

This lentil shepherds pie is one of those recipes that really sticks with you. It’s not just food—it’s comfort, warmth, and something that feels like home.

It’s perfect for chilly nights, dinner parties, or just when you need something grounding.

So if this dish brought even a little bit of calm to your day, don’t forget to save it or pin it on Pinterest. And let me know how it turned out in the comments—I always love hearing your twists and takes!