In a large bowl, whisk together all the dry ingredients. In a medium bowl, whisk together all the wet ingredients except for the boiling water. Whisk the wet ingredients into the dry ingredients and then stir in the boiling water. It will be a very thin batter.
Pour into two greased and floured 6.5” round cake pans and bake at 350F for 35-40 minutes, or until a toothpick inserted into the center comes out clean. Cool completely.
Cake from Molly Yeh, buttercream from Martha Stewart.
If you'd like to make a 9" layer cake, double everything. Start checking the cakes after they've baked for 30 minutes.