Mississippi Mud Cake Recipe with Espresso Fudge Icing

Ingredients

• 2 cups granulated sugar
• 2 sticks (8 ounces) unsalted butter
• ⅓ cup cocoa powder – I recommend Guittard Cocoa Rouge cocoa powder
• 1 cup water
• 2 cups all purpose flour, fork sifted with 3/4 teaspoon salt
• ½ cup sour cream or greek yogurt
• 2 eggs, lightly beaten
• 2 teaspoons pure vanilla extract
• ¼ cup cocoa powder
• 1 stick (4 ounces) unsalted butter
• ¼ cup milk or cream
• 1 teaspoon vanilla extract
• dash of salt
• 1 teaspoon of espresso powder
• (1) 16 ounce box plus confectioner's (powdered) sugar, sifted
• 1 cup chopped walnuts or pecans, optional