Chocolate Cake With Icing with eggs

3 eggs 1 cup sugar 3/4 cup vegetable oil 1/4 cup milk 3/4 cup all-purpose flour 1/2 cup cocoa 1/2 teaspoon baking powder 1/2 teaspoon salt 1/2 teaspoon[...]

1 (18 ounce) box chocolate cake mix (Betty Crocker preferred) 3 eggs (or as called for by your cake mix) 1/3 cup oil (or as called for by your cake mix) 1 1/3[...]

1/2 cup butter or 1/2 cup margarine 4 ounces unsweetened chocolate 1 1/2 cups sugar 2 teaspoons vanilla extract , divided 1 3/4 cups buttermilk 3 large eggs 1[...]