Good-Cooking - All Chocolate Boston Cream Cake

Ingredients

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 1 cup butter
• 1 cup water
• 1/4 cup cocoa
• 2 large eggs, lightly beaten
• 1/2 cup buttermilk
• 1 teaspoon baking soda
• 1 teaspoon pure vanilla extract
• 1 (3 7/8 ounce) box instant chocolate pudding mix
• 1 1/4 cup milk
• 1 (8 ounce) container frozen whipped topping
• 1/2 cup butter
• 6 tablespoons half-and-half
• 1 cup confectioners sugar