Preheat your oven to 350°F (175°C). Grease and flour an 8-inch round cake pan.
In a large mixing bowl, sift together the all-purpose flour, granulated sugar, baking soda, and salt.
In a separate bowl, combine the unsweetened almond milk, vegetable oil, white vinegar, and vanilla extract. Mix well.
Pour the wet ingredients into the dry ingredients. Stir gently with a spatula or whisk until just combined and smooth. Do not overmix.
Pour the batter into the prepared cake pan and smooth the top with a spatula.
Bake in the preheated oven for 28 to 30 minutes, or until a toothpick inserted into the center comes out clean.
Remove the cake from the oven and allow it to cool in the pan for 10 minutes.
After 10 minutes, run a knife around the edges of the pan and invert the cake onto a wire rack to cool completely before frosting or serving.