Best Vegan Potatoes Au Gratin

Vegan potatoes au gratin proves you don’t need a pound of cream and Gruyère to land that comforting layered casserole. Pre-baked potato slices stack with sauteed mirepoix and a thick savory gravy in place of the usual cheese sauce. A finishing dust of paprika and nutritional yeast on top gives the surface that golden gratin look and the umami punch that vegan dishes often miss.

The trick is starting with potatoes that are already baked, peeled, and sliced. Raw potatoes need a long covered bake and plenty of liquid to soften, but pre-baked slices are ready to soak up gravy and warm through in just 20 minutes. The casserole goes from prep to plate without dragging down a weeknight.

Nutritional yeast does double duty: it carries cheesy umami and browns in the dry oven heat into a flavorful crust. Soy sauce in the saute layer adds glutamates that round out the savory base. Together they trick the palate into reading this as a properly cheesy gratin.

Chef Tips

• Slice the baked potatoes when fully cool. Hot potatoes crumble under the knife and you’ll end up with mash instead of layers.
• Salt each layer lightly as you build. Distributed seasoning matters more in vegan cooking where there’s no salty cheese carrying flavor.
• Use a thick gravy. Thin gravy soaks straight into the potatoes and leaves the top dry.
• Cover with foil for the first 10 minutes if the top browns too fast. Uncover for the last 10 to crisp the nutritional yeast.

Variations

• Add a layer of sauteed mushrooms or wilted spinach between the potato layers for more vegetable depth.
• Swap the cheesy gravy for a cashew cream blended with garlic, lemon juice, and miso for a richer plant-based sauce.
• Top with toasted breadcrumbs along with the nutritional yeast for an extra-crisp finish.