Olive Garden Black Tie Mousse Cake

2 cups all-purpose flour
2 cups granulated sugar
3/4 cup cocoa powder
2 teaspoons baking soda
1 teaspoon baking powder
1/2 teaspoon salt
2 eggs
1 cup black coffee
1 cup milk
2 teaspoons vanilla extract
1/2 cup vegetable oil
3 teaspoons vanilla extract
1/4 cup butter
1/8 teaspoon salt
3 tablespoons milk
1 teaspoon vanilla extract
2 cups confectioners' sugar

Preheat oven to 350 degrees F.

Sift first 6 ingredients together in large bowl. Add eggs, coffee, milk, vegetable oil and the 2 teaspoons vanilla extract; blend until smooth. Pour thin batter into a greased 13 x 9-inch baking pan. Bake for 35 minutes.

Meanwhile, cream butter until soft and sir in confectioners' sugar, the 1/8 teaspoon salt, the 3 tablespoons milk, and the 1 teaspoon vanilla extract. Beat until smooth and creamy adding more milk, if necessary. Spread over warm cake.