Preheat oven to 350* F. Grease three 4-inch round cake pans with pan spray and insert a parchment circle into the bottom of each pan.
In a medium bowl, combine flour, baking powder and salt. Whisk to combine and set aside.
14 tablespoon All-Purpose Flour, ⅛ teaspoon Kosher Salt, 1 teaspoon Baking Powder
In a large bowl, combine sugar, non-dairy milk, melted non-dairy butter, white vinegar and vanilla. Whisk to combine, then add the dry ingredients and whisk to form the batter.
½ Cup Granulated Sugar, ½ Cup Non-Dairy Milk, 4 tablespoon Non-Dairy Butter, melted, 1 teaspoon White Vinegar, 1 teaspoon Vanilla Extract
Divide the batter between the 3 prepared cake pans. If you have a kitchen scale, it will be about 5 ounces of batter per pan. Use a spatula to even out the tops.
Bake the cake layers in a 350* F oven for 19-21 minutes, or until a toothpick inserted into the center of the cakes comes out clean. Allow the cake layers to cool completely before frosting.