Olive Garden's Black Tie Mousse Cake

2 c. flour
2 c. sugar
3/4 c. cocoa
2 tsp. baking soda
1 tsp. baking powder
1/2 tsp. salt plus 1/8 tsp. salt
2 eggs
1 c. black coffee
1 c. plus 3 T. milk
1/2 c. vegetable oil
3 tsp. vanilla, divided
1/4 c. butter
2 c. confectioners sugar

Sift first 5 ingredients and 1/2 tsp. salt together in large bowl. Add eggs, coffee, 1 cup milk, salad oil, and 2 tsp. vanilla; blend until smooth. Pour thin batter in greased 13x9" pan. Bake in 350F oven for 35 minutes.

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