Preheat your oven to 350°F (175°C).
Grease and line three 8-inch round cake pans with parchment paper.
In a measuring cup, combine the plant-based milk with the apple cider vinegar and let it sit for 5 minutes to create dairy-free buttermilk.
In a large bowl, whisk together the flour, granulated sugar, cocoa powder, baking powder, baking soda, and salt.
In another bowl, mix the dairy-free buttermilk, water, vegetable oil, dairy-free yogurt, and vanilla extract until smooth.
Add the wet ingredients to the dry ingredients, mixing until just combined. Do not overmix.
Divide the batter evenly among the prepared pans.
Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cakes to cool in the pans for 10 minutes, then transfer to a wire rack to cool completely.