French Onion Shepherd’s Pie with Lentils & Creamy Cauliflower Potato Mash

4.98 from 69 votes

French onion shepherd’s pie with lentils & cauliflower potato mash is a hearty and flavourful main course that will satisfy all eaters.

Overhead shot of a French onion shepherd’s pie in a skillet.
This post is sponsored by All-Clad
A single serving of lentil shepherd’s pie in a bowl topped with mashed potatoes and cauliflower.
An overhead shot of ingredients for a vegan shepherd’s pie.
An overhead shot of onion skins in a bowl.
Image shows a lot of sliced onions on a cutting board.

Another great holiday entertaining recipe for you! This French onion shepherd’s pie is a total knockout. Super comforting, hearty enough to serve as a plant-based main, make ahead-friendly, and just so flavourful from all of the caramelized onions. We top it with a creamy and satisfying cauliflower potato mash for a little extra vegetable goodness.

This recipe takes some extra time because of the caramelized onions. They’re combined with French lentils and other aromatics to form the base of this pie. Once all of that’s squared away (and you could definitely make the base portion several days in advance), we steam some cauliflower and potatoes and whip them up into fluffy clouds to dollop on top. This is about 2 hours of cooking when all is said and done, but that’s what holidays are all about, right? A little extra effort for all of your favourite people :)

I cooked all of these components, and even did the final bake on the pie itself, in pieces from the All-Clad Essentials Nonstick Set. While this post is supported by All-Clad, I have to say that I love cooking with these pans so much (and basically everything else that All-Clad makes). These pans have all the ease of nonstick (so much easier to clean), they can go straight from the stove to the oven, and they’re easy to store in your cabinets without getting scratched thanks to the tidy nesting capability. I’ve been working with All-Clad since the summer, and as someone who used to have a total mish mash of pots and pans, it definitely inspires cooking confidence to have all the right tools for the job.

With all that said, I hope that you give this cozy recipe a shot for your next gathering! If you’re in the throes of planning your holiday meals, I have all my best recipes rounded up right here. Is it too early to get a Christmas tree? Asking for a friend :) Have a great week!

Image shows caramelized onions being stirred.
A deep brown caramelized onion and lentil stew is shown in a pot with a ladle.
Cooked potatoes and cauliflower are being mashed with vegan butter.
Image shows creamy mashed potatoes and cauliflower being spread on top of a lentil stew mixture.
Image shows a shepherd’s pie before baking.
An overhead shot of a vegan French onion shepherd’s pie in a skillet on top of a beige tablecloth.

French Onion Shepherd’s Pie with Lentils and Creamy Cauliflower Potato Mash

French onion shepherd's pie with lentils & cauliflower potato mash is a hearty and flavourful holiday main course that will satisfy vegans AND omnivores.
4.98 from 69 votes
An overhead shot of a vegan french onion shepherd's pie topped with a cauliflower potato mash.
Prep Time: 1 hr
Cook Time: 2 hrs
Total Time: 3 hrs
Servings 6 -8



  • 2 tablespoons olive oil, plus extra
  • 3 lbs yellow onions, peeled and sliced into half moons
  • sea salt and ground black pepper, to taste
  • 1 tablespoon thyme leaves, minced
  • 1 bay leaf
  • 1 clove of garlic, minced
  • 1 tablespoon tomato paste
  • 1 ½ cups French lentils, rinsed
  • 1 ½ tablespoons sherry/balsamic vinegar
  • 1 ½ tablespoons gluten-free tamari soy sauce
  • 5 cups vegetable stock, plus extra


  • 2 cups water
  • 2 cloves of garlic, peeled and smashed
  • 1 ½ lbs Yukon gold potatoes, peeled and chopped
  • 4 cups cauliflower florets (from approximately ½ a large head)
  • 4 tablespoons vegan butter, at room temperature
  • ½ cup unsweetened non-dairy milk
  • 1 tablespoon nutritional yeast
  • sea salt and ground black pepper, to taste


  • Depending on sides, this recipe serves 6-8 people.
  • You could do an all cauliflower mash if you’re avoiding potatoes. Just substitute another 4 cups of chopped florets and start with only half the amount of non-dairy milk. Add more as needed until you reach a creamy consistency.
  • To make ahead: thoroughly cool the French onion/lentil base in your serving dish. Once cooled, cover the dish and store it in the fridge. Make the cauliflower potato mash and let it cool before storing in a separate sealable container in the fridge. On the day that you’re serving, evenly spread the cauliflower potato mash over the French onion filling. Drizzle the top with olive oil and bake in a 375 degree oven for 45 minutes.


  • Heat a large soup pot over medium heat. Pour in the olive oil and swirl it around. Add all of the sliced onions to the pot. You should hear a moderate sizzle. Sauté the onions, stirring often, until they are just starting to soften on the edges. Then, lower the heat slightly.
  • Keep cooking and stirring the onions occasionally until they are light golden brown, jammy, and super sweet. Not quite in the caramelized state, but getting there. This process will take anywhere from 45 minutes to an hour. Add splashes of water if the onions start to dry up/stick.
  • Increase the heat back to medium. Add the thyme, bay leaf, and garlic to the pot and stir until fragrant, about 30 seconds. Add the tomato paste and stir. Cook for about one minute. Add the lentils to the pot and stir. Then, add the sherry vinegar and tamari to the pot. Scrape up any browned bits on the bottom of the pot. Season everything with salt and pepper. Add the vegetable stock to the pot and stir once more. Cover the pot and bring it to a boil. Lower the heat to a simmer and then cook until lentils are tender, about 25-30 minutes. There should be just enough liquid to surround the onions and lentils. Add more vegetable stock if necessary.
  • Remove the bay leaf from the pot and allow the French onion base to cool slightly before transferring to a large (12-inch), oven-safe skillet or other baking dish. Set aside.
  • Make the creamy cauliflower potato mash. Pour the water into a large soup pot and bring it up to a boil. Pop the smashed garlic cloves in the water. Place the potatoes and cauliflower either directly into the pot or in a steamer insert. Keep the water at a strong simmer and close a lid on top of the pot. Steam the cauliflower and potatoes until the potatoes are fork-tender, about 20 minutes.
  • Drain the vegetables and return them to the pot. You can keep the garlic or toss it, your choice! Add the vegan butter, non-dairy milk, nutritional yeast, and lots of salt and pepper. Using a hand masher, mash the cauliflower and potatoes until smooth and creamy. Adjust the seasoning if necessary and set aside.
  • Preheat the oven to 375°F.
  • Smooth the French onion and lentil base out. Then, dollop the creamy cauliflower and potato mash on top. Carefully spread the mash out over the surface of the French onion and lentil base. Drizzle the top of the mash with olive oil and some extra pinches of salt and pepper.
  • Bake the French onion shepherd’s pie for 25 minutes, or until bubbly and totally heated through. You can broil the top for extra browning if you like. Remove the pie from the oven and let it sit for 5 minutes before serving in shallow bowls.
13/11/2019 (Last Updated: 13/11/2019)
Posted in: autumn, earthy, gluten free, holidays, lentils, main course, nut free, refined sugar-free, salty, sweet, umami, vegan, winter
Show 77 comments
Add comments & rating

Recipe Rating