Preheat oven to 350.

In the large bowl of a mixer, stir together sugar and flour and set aside.

In a saucepan, mix Coca Cola, oil, butter and cocoa and bring to a boil.

Pour the boiling Cola mixture over the flour mixture and beat well.

Add eggs, buttermilk, baking soda and vanilla and beat on medium for about a minute more.

Pour batter evenly into a greased and floured 13 x 9 inch baking pan and bake for about 25 to 30 minutes.

Immediately upon removing cake from oven, prepare frosting.

In a saucepan over medium heat, bring butter, cocoa powder and milk to JUST boiling. Remove from heat and whisk in powdered sugar and vanilla.

Spread on the cake while it's warm.

Let cake cool to room temperature, then cut and refrigerate until serving.

Serve with Vanilla Ice Cream and choice of toppings like whipped cream, sprinkles, etc.

Enjoy