1-2 tablespoons milk (as needed)Pre-heat oven to 350 degrees and grease two 9” round baking pans.
In a large bowl mix flour, sugar, cocoa, baking powder, baking soda, and salt. Add eggs, milk, vanilla extract, and oil. Beat on medium speed for 2 minutes. Stir in boiling water with a spatula or spoon. Evenly pour batter into both baking pans.
Bake in the oven for 30-35 minutes or until a toothpick comes out clean. Remove from oven and allow to fully cool.
To make the frosting- In a large bowl cream butter and add vanilla extract and salt. Beat on medium speed adding sugar 1 cup at a time. Add milk 1 tablespoon at a time until frosting has reached your desired consistency.