1Heat oven to 350°F (325°F for dark or nonstick pans). Grease two 8- or 9-inch round cake pans, or spray with baking spray with flour. Dissolve 1 tablespoon coffee in 1 1/4 cups water. Make cake batter as directed on box, using coffee mixture in place of the water. Bake and cool as directed.
2Dissolve 2 teaspoons coffee in 1 tablespoon cool water. Stir 2 teaspoons of the coffee mixture into frosting. In medium bowl, stir together whipped topping and remaining coffee mixture; gently stir in 1/4 cup of the frosting mixture.
3On serving plate, place 1 cake layer, rounded side down. Spread with half of the whipped topping mixture (about 3/4 cup) to within 1/4 inch of edge. Top with second layer, rounded side up. Frost side and top of cake with frosting. Pipe remaining whipped topping mixture around top of cake. Refrigerate 1 to 2 hours or until chilled. Garnish top of cake with espresso beans. Store covered in refrigerator.