• Preheat oven to 350 degrees F.
• Spray an 18x13 sheet cake pan with nonstick cooking spray.
• In a large mixing bowl, combine flour, sugar, and salt.
• In a medium saucepan over low heat, melt butter.
• Once the butter is melted, whisk in cocoa powder until thoroughly combined.
• Add boiling water and turn up the heat to medium.
• Allow mixture to boil for 30 seconds and immediately turn off the heat.
• Pour the cocoa/butter mixture over flour mixture, and stir lightly to cool.
• Turn up the heat to medium. Allow mixture to boil for 30 seconds and immediately turn off the heat.
• In a medium bowl, whisk together the buttermilk, eggs, baking soda, and vanilla.
• Stir buttermilk mixture into chocolate mixture and mix well.
• Pour into a baking tray and bake for 20 minutes.

Frosting

• While cake is baking, make the frosting.
• In a medium saucepan over low heat, melt butter. Once the butter is melted, whisk in cocoa powder until thoroughly combined.
• Add milk, vanilla, and powdered sugar whisking until all ingredients are fully incorporated.
• Pour over warm cake using an spatula to spread the frosting all over the cake.
• Serve and enjoy!