cake pans. i use a 13 x 9 inch pan or two- 9 inch standard cake rounds can be used.
in a medium bowl, whisk together the sifted flour, cocoa, sugar, baking powder, baking soda and salt; set aside.
in the bowl of a stand up mixer (fitted with a paddle attachment) on low speed, mix the oil, cooled melted butter, vanilla, eggs & milk. mix until well blended, about 2-3 minutes.
with the mixer on low, carefully add the dry ingredients. mix until well blended, scraping the sides & bottom of the bowl.
lastly, with the mixer on the lowest speed setting, begin to slowly pour in the boiling water in additions, stirring 