This vegan potato leek gratin is a comforting and creamy dish that's perfect for any occasion. The combination of tender potatoes and flavorful leeks layered with a rich, dairy-free sauce makes this a crowd-pleaser, whether you're vegan or not.
If you're not familiar with nutritional yeast, it's a deactivated yeast that adds a cheesy flavor to dishes and can be found in the health food section of most supermarkets. Coconut milk is another key ingredient, providing a creamy base for the sauce. Make sure to get the full-fat version for the best texture.

Ingredients For Vegan Potato Leek Gratin
Potatoes: Thinly sliced to ensure even cooking and a tender texture.
Leeks: Thinly sliced to add a mild, onion-like flavor.
Coconut milk: Provides a rich, creamy base for the sauce.
Nutritional yeast: Adds a cheesy, umami flavor without any dairy.
Olive oil: Used to mix with the sauce and add a touch of richness.
Garlic powder: Adds a subtle garlic flavor to the dish.
Salt: Enhances the overall flavor of the gratin.
Black pepper: Adds a hint of spice and depth to the dish.
Technique Tip for This Gratin
When slicing the potatoes and leeks, aim for uniform thickness to ensure even cooking. Using a mandoline slicer can help achieve consistent slices, which is crucial for the gratin to cook evenly and develop a cohesive texture. Additionally, make sure to thoroughly mix the coconut milk mixture to evenly distribute the nutritional yeast and seasonings, enhancing the overall flavor of the dish.
Suggested Side Dishes
Alternative Ingredients
potatoes - Substitute with sweet potatoes: Sweet potatoes add a slightly sweet flavor and are rich in vitamins A and C.
leeks - Substitute with onions: Onions provide a similar texture and a slightly stronger flavor, which can add depth to the dish.
coconut milk - Substitute with almond milk: Almond milk is a lighter alternative and still provides a creamy texture without the coconut flavor.
nutritional yeast - Substitute with miso paste: Miso paste adds a savory umami flavor, though it will change the overall taste profile slightly.
olive oil - Substitute with avocado oil: Avocado oil has a similar fat content and a mild flavor, making it a good alternative for cooking.
garlic powder - Substitute with fresh garlic: Fresh garlic offers a more robust and aromatic flavor compared to garlic powder.
salt - Substitute with soy sauce: Soy sauce can add a salty and umami flavor, though it will also add a bit of color to the dish.
black pepper - Substitute with white pepper: White pepper has a milder flavor and won't alter the color of the dish as much as black pepper.
Alternative Recipes Similar to This Gratin
How to Store or Freeze This Gratin
Allow the vegan potato leek gratin to cool completely at room temperature before storing. This helps prevent condensation, which can make the dish soggy.
Transfer the gratin to an airtight container. If you don't have a container large enough, you can cover the baking dish tightly with plastic wrap or aluminum foil.
Store the gratin in the refrigerator for up to 4 days. Reheat individual portions in the microwave or the entire dish in the oven at 350°F (175°C) until warmed through.
For freezing, first, ensure the gratin is completely cooled. Cut it into individual portions for easier reheating later.
Wrap each portion tightly in plastic wrap, then place them in a freezer-safe bag or container. Label with the date for reference.
Freeze the portions for up to 3 months. To reheat, thaw overnight in the refrigerator.
Reheat in the oven at 350°F (175°C) for about 20-25 minutes, or until heated through. You can also reheat in the microwave, but the oven will help maintain the texture better.
If the gratin appears dry after reheating, drizzle a little coconut milk or olive oil over the top before reheating to add moisture.
How to Reheat Leftovers
Oven Method: Preheat your oven to 350°F (175°C). Place the leftover Vegan Potato Leek Gratin in an oven-safe dish. Cover it with aluminum foil to prevent it from drying out. Bake for 20-25 minutes, or until heated through. For a crispy top, remove the foil during the last 5 minutes of reheating.
Microwave Method: Transfer a portion of the gratin to a microwave-safe dish. Cover it with a microwave-safe lid or a damp paper towel to retain moisture. Heat on medium power for 2-3 minutes, stirring halfway through to ensure even heating. Add an extra minute if needed, until the potatoes are hot.
Stovetop Method: Place the leftover gratin in a non-stick skillet over medium heat. Add a splash of coconut milk or vegetable broth to prevent sticking and to keep it moist. Cover the skillet with a lid and heat for about 10 minutes, stirring occasionally, until the potatoes are warmed through.
Air Fryer Method: Preheat your air fryer to 350°F (175°C). Place the gratin in an air fryer-safe dish. Heat for 5-7 minutes, checking halfway through to ensure it doesn't overcook. This method will give you a crispy top layer while keeping the inside tender.
Toaster Oven Method: Preheat your toaster oven to 350°F (175°C). Place the leftover gratin on a baking sheet or in a toaster oven-safe dish. Cover with aluminum foil and heat for 15-20 minutes, or until warmed through. Remove the foil for the last 5 minutes to crisp up the top.
Best Tools for Making This Gratin
Oven: Used to bake the gratin at the specified temperature to ensure the potatoes and leeks are cooked through and the top becomes golden brown.
Large bowl: Utilized to mix the coconut milk, nutritional yeast, olive oil, garlic powder, salt, and black pepper thoroughly.
Baking dish: The vessel in which the layered potatoes and leeks are baked.
Aluminum foil: Used to cover the baking dish during the initial baking period to help cook the potatoes evenly.
Knife: Essential for thinly slicing the potatoes and leeks.
Cutting board: Provides a stable surface for slicing the potatoes and leeks.
Measuring cups: Necessary for accurately measuring the coconut milk and leeks.
Measuring spoons: Used to measure the nutritional yeast, olive oil, garlic powder, salt, and black pepper precisely.
Spatula: Helps in spreading the coconut milk mixture evenly over the layers of potatoes and leeks.
Oven mitts: Protect your hands when handling the hot baking dish from the oven.
How to Save Time on This Recipe
Pre-slice the vegetables: Use a mandoline slicer to quickly and evenly slice the potatoes and leeks.
Use pre-made coconut milk: Opt for canned coconut milk to save time on preparation.
Mix the sauce ahead: Combine the coconut milk mixture ingredients in advance and store in the fridge.
Layer efficiently: Arrange the potatoes and leeks in the baking dish as you slice them to save time.
Preheat the oven: Start preheating your oven before you begin assembling the dish to ensure it's ready when you are.

Vegan Potato Leek Gratin
Ingredients
Main Ingredients
- 4 cups potatoes, thinly sliced
- 2 cups leeks, thinly sliced
- 2 cups coconut milk
- 2 tablespoon nutritional yeast
- 2 tablespoon olive oil
- 1 teaspoon garlic powder
- 1 teaspoon salt
- 0.5 teaspoon black pepper
Instructions
- Preheat your oven to 375°F (190°C).
- In a large bowl, mix the coconut milk, nutritional yeast, olive oil, garlic powder, salt, and black pepper.
- Layer half of the sliced potatoes in a baking dish. Top with half of the leeks. Pour half of the coconut milk mixture over the top.
- Repeat the layers with the remaining potatoes, leeks, and coconut milk mixture.
- Cover the baking dish with aluminum foil and bake for 40 minutes.
- Remove the foil and bake for an additional 20 minutes, or until the top is golden brown and the potatoes are tender.
- Let it cool for a few minutes before serving.
Nutritional Value
Keywords
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