Step 1

Preheat the oven to 350°F/180°C and grease the baking dish with non-stick spray or vegan butter.

Step 2

Thinly slice the potatoes and place them in a bowl of cold water. Set this aside.

Step 3

In a saucepan, sauté onions in olive oil for 5 minutes. Add the garlic and herbs and cook for an additional minute. Sprinkle flour into the pan and mix thoroughly. Cook for 30 seconds.

Step 4

Gradually pour soy milk into the saucepan while whisking continuously. Cook the sauce for 5-7 minutes until it thickens and becomes bubbly. Add shredded cheese and continue cooking until fully melted.

Step 5

Pat the potato slices dry with paper towels and arrange them in a baking dish, creating a single layer. Season lightly with salt and pepper. Pour 1/4 of the sauce over the potatoes. Repeat the layers until all the sauce is used. Cover the baking dish with foil and bake for 1 hour and 20 minutes. Remove the foil and bake for an additional 40 minutes.