The best chocolate cake with ganache frosting ever!
Cake Instructions: In a large mixing bowl, add sugar. Then sift the flour and cocoa powder into the bowl. Sifting the flour and cocoa is an important step so don't skip it!
Then add the butter on top of the sifted ingredients.
Put the water and the oil in a small saucepan and bring to a boil. Pour all at once over the flour, sugar, and cocoa mixture.
Stir until well combined.
Add the eggs, buttermilk, soda, and vanilla and stir until smooth.
Spray baking dish with cooking spray. Pour into a 9x13 cake pan or large cookie sheet and bake at 350º for 25-30 minutes or until cake bounces back when touched lightly in the middle. Don't over bake.
Put the sugar, milk, and butter into a saucepan. Bring to a boil. Do not boil for more than 20 seconds. Remove from heat and add the chocolate chips. Stir until dissolved and then add the vanilla and stir again. If using the marshmallows and/or the chopped nuts, add those in and gently stir. Immediately pour onto the cake and spread. This sets ups fast so work quickly.
This is best if made the day ahead. Allow at least 6-8 hours to set up if possible.