Preheat oven to 350°F and prep your 2 pans by buttering the inside first and then adding just enough flour to coat the entire bottom and sides of the pan.
In a large bowl, combine the dry ingredients (flour, sugar, baking soda).
In a medium bowl, combine the wet ingredients (milk, lemon juice, vanilla extract, apple cider vinegar).
Making a slight hole in the dry ingredients, pour the wet ingredients in slowly. Being to mix by hand slowly by using a spatula and circling the perimeter of the bowl and then pulling the spatula down the middle towards you. Continue this motion until fully incorporated (this allows the air to remain in the mixture).
Split the mixture evenly between the two pans and quickly place in the oven (the mixture of the baking soda and vinegar is crucial is helping the cake rise, but you want this to occur in the oven).
Bake for 25-30 minutes until golden brown and then remove cakes from pans and let them cool completely on a wire rack.