Gather all your ingredients on the counter.

In your blender or food processor, combine the plant-based milk, apple cider vinegar, and Dijon mustard.

With the blender running, slowly drizzle in the neutral oil.

Once the oil is incorporated, add the salt, garlic powder, and lemon juice if using.

Continue to blend until the mixture is thick and creamy.

Taste and adjust the seasoning as needed.

Use a spatula to transfer the mayonnaise into your storage container.

Refrigerate your mayonnaise for at least 30 minutes before serving.